diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index efb9808..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,24 +0,0 @@
-This is free and unencumbered software released into the public domain.
-
-Anyone is free to copy, modify, publish, use, compile, sell, or
-distribute this software, either in source code form or as a compiled
-binary, for any purpose, commercial or non-commercial, and by any
-means.
-
-In jurisdictions that recognize copyright laws, the author or authors
-of this software dedicate any and all copyright interest in the
-software to the public domain. We make this dedication for the benefit
-of the public at large and to the detriment of our heirs and
-successors. We intend this dedication to be an overt act of
-relinquishment in perpetuity of all present and future rights to this
-software under copyright law.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
-OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-OTHER DEALINGS IN THE SOFTWARE.
-
-For more information, please refer to <https://unlicense.org/>
diff --git a/Makefile b/Makefile
deleted file mode 100644
index ecbfafa..0000000
--- a/Makefile
+++ /dev/null
@@ -1,4 +0,0 @@
-lint:
-	golangci-lint run ./...
-
-.PHONY: lint
diff --git a/create.sh b/create.sh
deleted file mode 100755
index cd8458f..0000000
--- a/create.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/bin/bash
-
-num=$1
-
-echo "$num" | grep -q "^[1-9][0-9]\{,4\}$" || {
-    echo "Err: no valid number given" >&2
-    exit 1
-}
-
-parent=$((num / 100))
-pdir="solutions/${parent}/q${num}"
-sol_file="${pdir}/solution.go"
-
-if [ -f "$sol_file" ]; then
-    exit 0
-fi
-
-echo "Creating template for question No. $num" >&2
-mkdir -pv "$pdir"
-echo "package q$num" > "$sol_file"
-echo "Created $sol_file"
diff --git a/go.mod b/go.mod
index 9e38376..e062fa1 100644
--- a/go.mod
+++ b/go.mod
@@ -1,15 +1,3 @@
 module leetcode-go
 
 go 1.25.5
-
-require (
-	github.com/emirpasic/gods/v2 v2.0.0-alpha
-	github.com/k0kubun/pp/v3 v3.5.0
-)
-
-require (
-	github.com/mattn/go-colorable v0.1.14 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	golang.org/x/sys v0.29.0 // indirect
-	golang.org/x/text v0.26.0 // indirect
-)
diff --git a/go.sum b/go.sum
deleted file mode 100644
index 0aa4e6a..0000000
--- a/go.sum
+++ /dev/null
@@ -1,13 +0,0 @@
-github.com/emirpasic/gods/v2 v2.0.0-alpha h1:dwFlh8pBg1VMOXWGipNMRt8v96dKAIvBehtCt6OtunU=
-github.com/emirpasic/gods/v2 v2.0.0-alpha/go.mod h1:W0y4M2dtBB9U5z3YlghmpuUhiaZT2h6yoeE+C1sCp6A=
-github.com/k0kubun/pp/v3 v3.5.0 h1:iYNlYA5HJAJvkD4ibuf9c8y6SHM0QFhaBuCqm1zHp0w=
-github.com/k0kubun/pp/v3 v3.5.0/go.mod h1:5lzno5ZZeEeTV/Ky6vs3g6d1U3WarDrH8k240vMtGro=
-github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
-github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
-github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
-github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
-golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.29.0 h1:TPYlXGxvx1MGTn2GiZDhnjPA9wZzZeGKHHmKhHYvgaU=
-golang.org/x/sys v0.29.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.26.0 h1:P42AVeLghgTYr4+xUnTRKDMqpar+PtX7KWuNQL21L8M=
-golang.org/x/text v0.26.0/go.mod h1:QK15LZJUUQVJxhz7wXgxSy/CJaTFjd0G+YLonydOVQA=
diff --git a/solutions/0/q15/solution.go b/solutions/0/q15/solution.go
deleted file mode 100644
index 69d9fcd..0000000
--- a/solutions/0/q15/solution.go
+++ /dev/null
@@ -1,65 +0,0 @@
-package q15
-
-import "slices"
-
-func sortAndDedup3(nums []int) []int {
-	slices.Sort(nums)
-	head, dup := 0, 0
-	for i := 1; i < len(nums); i++ {
-		if nums[i] == nums[head] {
-			dup++
-		} else {
-			dup = 0
-		}
-		if dup < 3 {
-			head++
-			nums[head] = nums[i]
-		}
-	}
-	return nums[:head+1]
-}
-
-func threeSum(nums []int) [][]int {
-	nums = sortAndDedup3(nums)
-	ret := [][]int{}
-
-	appendResult := func(a, b, c int) {
-		triplet := []int{a, b, c}
-		if len(ret) > 0 && slices.Equal(triplet, ret[len(ret)-1]) {
-			return
-		}
-		ret = append(ret, triplet)
-	}
-
-	for i := 0; i < len(nums)-2; i++ {
-		if nums[i] > 0 {
-			break
-		}
-		wants := -nums[i]
-		l, r := i+1, len(nums)-1
-		for l < r {
-			for l < r && nums[l]+nums[r] > wants {
-				r--
-			}
-			if l < r && nums[l]+nums[r] == wants {
-				appendResult(nums[i], nums[l], nums[r])
-				r--
-			}
-			for l < r && nums[l]+nums[r] < wants {
-				l++
-			}
-			if l < r && nums[l]+nums[r] == wants {
-				appendResult(nums[i], nums[l], nums[r])
-				l++
-			}
-		}
-
-		// skip same numbers
-		for ; i < len(nums)-2 && nums[i] == nums[i+1]; i++ {
-		}
-	}
-
-	return ret
-}
-
-var _ = threeSum
diff --git a/solutions/0/q17/solution.go b/solutions/0/q17/solution.go
deleted file mode 100644
index 632e70d..0000000
--- a/solutions/0/q17/solution.go
+++ /dev/null
@@ -1,39 +0,0 @@
-package q17
-
-var alphabets = [][]byte{
-	[]byte("abc"),
-	[]byte("def"),
-	[]byte("ghi"),
-	[]byte("jkl"),
-	[]byte("mno"),
-	[]byte("pqrs"),
-	[]byte("tuv"),
-	[]byte("wxyz"),
-}
-
-func combinations(offsets []int, i int, buffer []byte, strings []string) []string {
-	if buffer == nil {
-		buffer = make([]byte, len(offsets))
-	}
-
-	if i == len(offsets) {
-		return append(strings, string(buffer))
-	}
-
-	for _, c := range alphabets[offsets[i]] {
-		buffer[i] = c
-		strings = combinations(offsets, i+1, buffer, strings)
-	}
-	return strings
-}
-
-func letterCombinations(digits string) []string {
-	offsets := make([]int, len(digits))
-	for i := range len(digits) {
-		offsets[i] = int(digits[i] - '2')
-	}
-
-	return combinations(offsets, 0, nil, []string{})
-}
-
-var _ = letterCombinations
diff --git a/solutions/0/q20/solution.go b/solutions/0/q20/solution.go
deleted file mode 100644
index 254d63b..0000000
--- a/solutions/0/q20/solution.go
+++ /dev/null
@@ -1,32 +0,0 @@
-package q20
-
-func isValid(s string) bool {
-	stack := make([]byte, 0, len(s)/2)
-
-	for i := range len(s) {
-		switch s[i] {
-		case '(', '[', '{':
-			stack = append(stack, s[i])
-		case ')':
-			if len(stack) == 0 || stack[len(stack)-1] != '(' {
-				return false
-			}
-			stack = stack[:len(stack)-1]
-
-		case ']':
-			if len(stack) == 0 || stack[len(stack)-1] != '[' {
-				return false
-			}
-			stack = stack[:len(stack)-1]
-
-		case '}':
-			if len(stack) == 0 || stack[len(stack)-1] != '{' {
-				return false
-			}
-			stack = stack[:len(stack)-1]
-		}
-	}
-	return len(stack) == 0
-}
-
-var _ = isValid
diff --git a/solutions/0/q35/solution.go b/solutions/0/q35/solution.go
deleted file mode 100644
index 15f6011..0000000
--- a/solutions/0/q35/solution.go
+++ /dev/null
@@ -1,19 +0,0 @@
-package q35
-
-func searchInsert(nums []int, target int) int {
-	l, r := 0, len(nums)
-	for l < r {
-		mid := (l + r) / 2
-		switch {
-		case nums[mid] == target:
-			return mid
-		case nums[mid] > target:
-			r = mid
-		default:
-			l = mid + 1
-		}
-	}
-	return l
-}
-
-var _ = searchInsert
diff --git a/solutions/0/q53/solution.go b/solutions/0/q53/solution.go
deleted file mode 100644
index af32086..0000000
--- a/solutions/0/q53/solution.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package q53
-
-import "math"
-
-func maxSubArray(nums []int) int {
-	sum := 0
-	minSubstract := 0
-	maxSubArr := math.MinInt
-	for i := range nums {
-		sum += nums[i]
-		nums[i] = sum
-		maxSubArr = max(maxSubArr, nums[i]-minSubstract)
-		minSubstract = min(minSubstract, nums[i])
-	}
-	return maxSubArr
-}
-
-var _ = maxSubArray
diff --git a/solutions/0/q66/solution.go b/solutions/0/q66/solution.go
deleted file mode 100644
index fdcfb96..0000000
--- a/solutions/0/q66/solution.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package q66
-
-func plusOne(digits []int) []int {
-	digits[len(digits)-1]++
-	for i := len(digits) - 1; i > 0; i-- {
-		if digits[i] > 9 {
-			digits[i] -= 10
-			digits[i-1]++
-		} else {
-			break
-		}
-	}
-	if digits[0] > 9 {
-		digits[0] -= 10
-		ret := make([]int, 0, len(digits)+1)
-		ret = append(ret, 1)
-		return append(ret, digits...)
-	}
-	return digits
-}
-
-var _ = plusOne
diff --git a/solutions/0/q67/solution.go b/solutions/0/q67/solution.go
deleted file mode 100644
index b1618ef..0000000
--- a/solutions/0/q67/solution.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package q67
-
-func toDigit(byt byte) uint8  { return byt - '0' }
-func toByte(digit uint8) byte { return '0' + digit }
-
-func addBinary(a string, b string) string {
-	lenA, lenB := len(a), len(b)
-	ret := make([]byte, max(lenA, lenB)+1)
-	var carry uint8
-	for i := range ret {
-		d := carry
-		if i < lenA {
-			d += toDigit(a[lenA-i-1])
-		}
-		if i < lenB {
-			d += toDigit(b[lenB-i-1])
-		}
-		carry = d / 2
-		ret[len(ret)-i-1] = toByte(d % 2)
-	}
-
-	if ret[0] != '1' {
-		return string(ret[1:])
-	}
-	return string(ret)
-}
-
-var _ = addBinary
diff --git a/solutions/0/q69/solution.go b/solutions/0/q69/solution.go
deleted file mode 100644
index f02eb65..0000000
--- a/solutions/0/q69/solution.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package q69
-
-func mySqrt(x int) int {
-	if x < 2 {
-		return x
-	}
-	l, r := 0, x/2+1
-	for l < r {
-		m := (l + r) / 2
-		sq := m * m
-		switch {
-		case sq == x:
-			return m
-		case sq < x:
-			if (m+1)*(m+1) > x {
-				return m
-			}
-			l = m + 1
-		case sq > x:
-			r = m
-		}
-	}
-	return -1
-}
-
-var _ = mySqrt
diff --git a/solutions/0/q70/solution.go b/solutions/0/q70/solution.go
deleted file mode 100644
index 540545d..0000000
--- a/solutions/0/q70/solution.go
+++ /dev/null
@@ -1,24 +0,0 @@
-package q70
-
-func nWays(n, i int, cache []int) int {
-	if i == n {
-		return 1
-	}
-	if i > n {
-		return 0
-	}
-	if cache == nil {
-		cache = make([]int, n)
-	} else if cache[i] != 0 {
-		return cache[i]
-	}
-	ret := nWays(n, i+1, cache) + nWays(n, i+2, cache)
-	cache[i] = ret
-	return ret
-}
-
-func climbStairs(n int) int {
-	return nWays(n, 0, nil)
-}
-
-var _ = climbStairs
diff --git a/solutions/0/q9/solution.go b/solutions/0/q9/solution.go
deleted file mode 100644
index faf307a..0000000
--- a/solutions/0/q9/solution.go
+++ /dev/null
@@ -1,18 +0,0 @@
-package q9
-
-import "strconv"
-
-func isPalindrome(x int) bool {
-	if x < 0 {
-		return false
-	}
-	str := strconv.FormatInt(int64(x), 10)
-	for i := range len(str) / 2 {
-		if str[i] != str[len(str)-1-i] {
-			return false
-		}
-	}
-	return true
-}
-
-var _ = isPalindrome
diff --git a/solutions/1/q104/solution.go b/solutions/1/q104/solution.go
deleted file mode 100644
index 78fa9ca..0000000
--- a/solutions/1/q104/solution.go
+++ /dev/null
@@ -1,20 +0,0 @@
-package q104
-
-type TreeNode struct {
-	Val   int
-	Left  *TreeNode
-	Right *TreeNode
-}
-
-func md(d int, node *TreeNode) int {
-	if node == nil {
-		return d - 1
-	}
-	return max(md(d+1, node.Left), md(d+1, node.Right))
-}
-
-func maxDepth(root *TreeNode) int {
-	return md(1, root)
-}
-
-var _ = maxDepth
diff --git a/solutions/1/q108/solution.go b/solutions/1/q108/solution.go
deleted file mode 100644
index 2de7147..0000000
--- a/solutions/1/q108/solution.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package q108
-
-type TreeNode struct {
-	Val   int
-	Left  *TreeNode
-	Right *TreeNode
-}
-
-func sortedArrayToBST(nums []int) *TreeNode {
-	if len(nums) == 0 {
-		return nil
-	}
-	if len(nums) == 1 {
-		return &TreeNode{Val: nums[0]}
-	}
-
-	l, r := nums[:len(nums)/2], nums[len(nums)/2+1:]
-	m := nums[len(nums)/2]
-	return &TreeNode{
-		Val:   m,
-		Left:  sortedArrayToBST(l),
-		Right: sortedArrayToBST(r),
-	}
-}
-
-var _ = sortedArrayToBST
diff --git a/solutions/1/q120/solution.go b/solutions/1/q120/solution.go
deleted file mode 100644
index 5978b01..0000000
--- a/solutions/1/q120/solution.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package q120
-
-func minimumTotal(triangle [][]int) int {
-	size := len(triangle)
-
-	for row := size - 2; row >= 0; row-- {
-		for i := range triangle[row] {
-			triangle[row][i] += min(triangle[row+1][i], triangle[row+1][i+1])
-		}
-	}
-	return triangle[0][0]
-}
-
-var _ = minimumTotal
diff --git a/solutions/1/q136/solution.go b/solutions/1/q136/solution.go
deleted file mode 100644
index f1a8404..0000000
--- a/solutions/1/q136/solution.go
+++ /dev/null
@@ -1,11 +0,0 @@
-package q136
-
-func singleNumber(nums []int) int {
-	x := 0
-	for _, num := range nums {
-		x ^= num
-	}
-	return x
-}
-
-var _ = singleNumber
diff --git a/solutions/1/q141/solution.go b/solutions/1/q141/solution.go
deleted file mode 100644
index e927c9f..0000000
--- a/solutions/1/q141/solution.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package q141
-
-type ListNode struct {
-	Val  int
-	Next *ListNode
-}
-
-func hasCycle(head *ListNode) bool {
-	if head == nil {
-		return false
-	}
-
-	p1, p2 := head, head
-	for {
-		for range 2 {
-			p2 = p2.Next
-			switch p2 {
-			case nil:
-				return false
-			case p1:
-				return true
-			}
-		}
-		p1 = p1.Next
-	}
-}
-
-var _ = hasCycle
diff --git a/solutions/1/q190/solution.go b/solutions/1/q190/solution.go
deleted file mode 100644
index 31c77df..0000000
--- a/solutions/1/q190/solution.go
+++ /dev/null
@@ -1,13 +0,0 @@
-package q190
-
-func reverseBits(n int) int {
-	ret := 0
-	for i := range 32 {
-		if n|(1<<i) == n {
-			ret |= 1 << (31 - i)
-		}
-	}
-	return ret
-}
-
-var _ = reverseBits
diff --git a/solutions/1/q191/solution.go b/solutions/1/q191/solution.go
deleted file mode 100644
index 6aad68a..0000000
--- a/solutions/1/q191/solution.go
+++ /dev/null
@@ -1,13 +0,0 @@
-package q191
-
-func hammingWeight(n int) int {
-	num := 0
-	for ; n > 0; n >>= 1 {
-		if n|1 == n {
-			num++
-		}
-	}
-	return num
-}
-
-var _ = hammingWeight
diff --git a/solutions/1/q199/solution.go b/solutions/1/q199/solution.go
deleted file mode 100644
index 3ee35a9..0000000
--- a/solutions/1/q199/solution.go
+++ /dev/null
@@ -1,37 +0,0 @@
-package q199
-
-type TreeNode struct {
-	Val   int
-	Left  *TreeNode
-	Right *TreeNode
-}
-
-func rightSideView(root *TreeNode) []int {
-	ret := []int{}
-
-	type qElem struct {
-		height int
-		node   *TreeNode
-	}
-
-	queue := []qElem{{0, root}}
-	var last *qElem
-	for ; len(queue) > 0; queue = queue[1:] {
-		cur := &queue[0]
-		if cur.node == nil {
-			continue
-		}
-		if last != nil && last.height < cur.height {
-			ret = append(ret, last.node.Val)
-		}
-		last = cur
-		queue = append(queue, qElem{cur.height + 1, cur.node.Left}, qElem{cur.height + 1, cur.node.Right})
-	}
-	if last != nil {
-		ret = append(ret, last.node.Val)
-	}
-
-	return ret
-}
-
-var _ = rightSideView
diff --git a/solutions/2/q200/solution.go b/solutions/2/q200/solution.go
deleted file mode 100644
index 9564d9a..0000000
--- a/solutions/2/q200/solution.go
+++ /dev/null
@@ -1,31 +0,0 @@
-package q200
-
-const (
-	VISITED byte = '.'
-	LAND    byte = '1'
-)
-
-func traverse(grid [][]byte, x, y int) int {
-	if x < 0 || y < 0 || x >= len(grid[0]) || y >= len(grid) || grid[y][x] != LAND {
-		return 0
-	}
-
-	grid[y][x] = VISITED
-	traverse(grid, x+1, y)
-	traverse(grid, x-1, y)
-	traverse(grid, x, y+1)
-	traverse(grid, x, y-1)
-	return 1
-}
-
-func numIslands(grid [][]byte) int {
-	count := 0
-	for y := range grid {
-		for x := range grid[y] {
-			count += traverse(grid, x, y)
-		}
-	}
-	return count
-}
-
-var _ = numIslands
diff --git a/solutions/2/q208/solution.go b/solutions/2/q208/solution.go
deleted file mode 100644
index 87c3ca2..0000000
--- a/solutions/2/q208/solution.go
+++ /dev/null
@@ -1,105 +0,0 @@
-package q208
-
-type tNode struct {
-	str     string
-	childs  [26]*tNode
-	hasWord bool
-}
-
-func (n *tNode) index() int { return index(n.str) }
-
-func (n *tNode) split(prefixLen int) (*tNode, *tNode) {
-	if len(n.str) < prefixLen {
-		panic("cannot split node")
-	}
-	if len(n.str) == prefixLen {
-		return n, nil
-	}
-
-	prefix := n.str[:prefixLen]
-	n.str = n.str[prefixLen:]
-	p := &tNode{str: prefix}
-	p.childs[n.index()] = n
-	return p, n
-}
-
-func commonPrefix(a, b string) int {
-	minLen := min(len(a), len(b))
-	for i := range minLen {
-		if a[i] != b[i] {
-			return i
-		}
-	}
-	return minLen
-}
-
-func index(str string) int {
-	if len(str) > 0 {
-		return int(str[0] - 'a')
-	}
-	return -1 // root
-}
-
-type Trie struct {
-	root *tNode
-}
-
-func Constructor() Trie {
-	return Trie{
-		root: &tNode{},
-	}
-}
-
-func (t *Trie) Insert(word string) {
-	node := t.root
-	for len(word) > 0 {
-		idx := index(word)
-		next := node.childs[idx]
-		if next != nil {
-			pflen := commonPrefix(word, next.str)
-			next, _ = next.split(pflen)
-			node.childs[next.index()] = next
-			word = word[pflen:]
-		} else {
-			next = &tNode{str: word}
-			word = ""
-			node.childs[idx] = next
-		}
-		node = next
-	}
-	node.hasWord = true
-}
-
-func (t *Trie) Search(word string) bool {
-	node := t.root
-	for len(word) > 0 {
-		next := node.childs[index(word)]
-		if next == nil {
-			return false
-		}
-		pflen := commonPrefix(word, next.str)
-		if pflen != len(next.str) {
-			return false
-		}
-		word = word[pflen:]
-		node = next
-	}
-	return node.hasWord
-}
-
-func (t *Trie) StartsWith(prefix string) bool {
-	node := t.root
-	for len(prefix) > 0 {
-		next := node.childs[index(prefix)]
-		if next == nil {
-			return false
-		}
-		pflen := commonPrefix(prefix, next.str)
-		if pflen != len(next.str) && pflen != len(prefix) {
-			return false
-		}
-		prefix = prefix[pflen:]
-		node = next
-	}
-	return true
-}
diff --git a/solutions/2/q215/solution.go b/solutions/2/q215/solution.go
deleted file mode 100644
index 41c54d3..0000000
--- a/solutions/2/q215/solution.go
+++ /dev/null
@@ -1,37 +0,0 @@
-package q215
-
-func findKthLargest(nums []int, k int) int {
-	// build max-heap
-	for i := 1; i < len(nums); i++ {
-		for j := i; j > 0; j = (j - 1) / 2 {
-			parent := (j - 1) / 2
-			if nums[j] > nums[parent] {
-				nums[j], nums[parent] = nums[parent], nums[j]
-			}
-		}
-	}
-
-	for range k - 1 {
-		// pop the heap
-		nums[0] = nums[len(nums)-1]
-		nums = nums[:len(nums)-1]
-
-		i := 0
-		for i*2+1 < len(nums) {
-			l, r := i*2+1, i*2+2
-			next := l
-			if r < len(nums) && nums[r] > nums[l] {
-				next = r
-			}
-			if nums[i] >= nums[next] {
-				break
-			}
-			nums[i], nums[next] = nums[next], nums[i]
-			i = next
-		}
-	}
-
-	return nums[0]
-}
-
-var _ = findKthLargest
diff --git a/solutions/2/q228/solution.go b/solutions/2/q228/solution.go
deleted file mode 100644
index 15e303f..0000000
--- a/solutions/2/q228/solution.go
+++ /dev/null
@@ -1,32 +0,0 @@
-package q228
-
-import (
-	"fmt"
-	"strconv"
-)
-
-func addToRanges(output []string, a, b int) []string {
-	if a == b {
-		return append(output, strconv.FormatInt(int64(a), 10))
-	}
-	return append(output, fmt.Sprintf("%d->%d", a, b))
-}
-
-func summaryRanges(nums []int) []string {
-	if len(nums) == 0 {
-		return nil
-	}
-
-	output := []string{}
-	l := 0
-	for r := 1; r < len(nums); r++ {
-		if nums[r]-nums[r-1] != 1 {
-			output = addToRanges(output, nums[l], nums[r-1])
-			l = r
-		}
-	}
-	output = addToRanges(output, nums[l], nums[len(nums)-1])
-	return output
-}
-
-var _ = summaryRanges
diff --git a/solutions/24/q2483/solution.go b/solutions/24/q2483/solution.go
deleted file mode 100644
index 2e6b54e..0000000
--- a/solutions/24/q2483/solution.go
+++ /dev/null
@@ -1,29 +0,0 @@
-package q2483
-
-func bestClosingTime(customers string) int {
-	numY := 0
-	for i := range len(customers) {
-		if customers[i] == 'Y' {
-			numY++
-		}
-	}
-	minCloseHour := 0
-	minPenalty := numY
-	penalty := numY
-	for i := range len(customers) {
-		// close at (i + 1)th hour
-		switch customers[i] {
-		case 'N':
-			penalty++
-		case 'Y':
-			penalty--
-		}
-		if penalty < minPenalty {
-			minPenalty = penalty
-			minCloseHour = i + 1
-		}
-	}
-	return minCloseHour
-}
-
-var _ = bestClosingTime
diff --git a/solutions/3/q383/solution.go b/solutions/3/q383/solution.go
deleted file mode 100644
index 8e6f390..0000000
--- a/solutions/3/q383/solution.go
+++ /dev/null
@@ -1,25 +0,0 @@
-package q383
-
-func canConstruct(ransomNote string, magazine string) bool {
-	counts := make([]int, 'z'-'a'+1)
-
-	for _, c := range magazine {
-		if c < 'a' || c > 'z' {
-			continue
-		}
-		counts[int(c)-int('a')]++
-	}
-	for _, c := range ransomNote {
-		if c < 'a' || c > 'z' {
-			continue
-		}
-		offset := int(c) - int('a')
-		counts[offset]--
-		if counts[offset] < 0 {
-			return false
-		}
-	}
-	return true
-}
-
-var _ = canConstruct
diff --git a/solutions/30/q3075/solution.go b/solutions/30/q3075/solution.go
deleted file mode 100644
index e319b8d..0000000
--- a/solutions/30/q3075/solution.go
+++ /dev/null
@@ -1,14 +0,0 @@
-package q3075
-
-import "slices"
-
-func maximumHappinessSum(happiness []int, k int) int64 {
-	slices.Sort(happiness)
-	var sum int64
-	for i := range k {
-		sum += max(0, int64(happiness[len(happiness)-1-i]-i))
-	}
-	return sum
-}
-
-var _ = maximumHappinessSum
diff --git a/solutions/5/q530/solution.go b/solutions/5/q530/solution.go
deleted file mode 100644
index 673014c..0000000
--- a/solutions/5/q530/solution.go
+++ /dev/null
@@ -1,37 +0,0 @@
-package q530
-
-import "math"
-
-type TreeNode struct {
-	Val   int
-	Left  *TreeNode
-	Right *TreeNode
-}
-
-func getMinimumDifference(root *TreeNode) int {
-	minDiff := math.MaxInt
-	var last *int
-
-	var check = func(num int) {
-		if last == nil {
-			last = &num
-			return
-		}
-		minDiff = min(minDiff, num-*last)
-		*last = num
-	}
-	var traverse func(node *TreeNode)
-	traverse = func(node *TreeNode) {
-		if node == nil {
-			return
-		}
-		traverse(node.Left)
-		check(node.Val)
-		traverse(node.Right)
-	}
-	traverse(root)
-
-	return minDiff
-}
-
-var _ = getMinimumDifference
diff --git a/solutions/6/q637/solution.go b/solutions/6/q637/solution.go
deleted file mode 100644
index a6822d5..0000000
--- a/solutions/6/q637/solution.go
+++ /dev/null
@@ -1,43 +0,0 @@
-package q637
-
-type TreeNode struct {
-	Val   int
-	Left  *TreeNode
-	Right *TreeNode
-}
-
-func averageOfLevels(root *TreeNode) []float64 {
-	type qElem struct {
-		level int
-		node  *TreeNode
-	}
-
-	ret := []float64{}
-	level := 0
-	n := 0 // number of nodes
-	var sum float64
-
-	queue := []qElem{{level: 0, node: root}}
-	for ; len(queue) > 0; queue = queue[1:] {
-		curr := &queue[0]
-		if curr.level == level {
-			sum += float64(curr.node.Val)
-			n++
-		} else {
-			ret = append(ret, sum/float64(n))
-			sum = float64(curr.node.Val)
-			n = 1
-			level = curr.level
-		}
-		if curr.node.Left != nil {
-			queue = append(queue, qElem{curr.level + 1, curr.node.Left})
-		}
-		if curr.node.Right != nil {
-			queue = append(queue, qElem{curr.level + 1, curr.node.Right})
-		}
-	}
-	ret = append(ret, sum/float64(n))
-	return ret
-}
-
-var _ = averageOfLevels
diff --git a/solutions/9/q909/solution.go b/solutions/9/q909/solution.go
deleted file mode 100644
index bd1e397..0000000
--- a/solutions/9/q909/solution.go
+++ /dev/null
@@ -1,50 +0,0 @@
-package q909
-
-func coord(n, num int) (x, y int) {
-	num -= 1
-	row := num / n
-	y = n - row - 1
-	x = num % n
-	if row%2 == 1 {
-		x = n - 1 - x
-	}
-	return
-}
-
-func snakesAndLadders(board [][]int) int {
-	n, sqN := len(board), len(board)*len(board)
-	leastRolls := make([]int, sqN)
-	if len(leastRolls) == 1 {
-		return 0
-	}
-
-	queue := make([]int, 0, sqN)
-	queue = append(queue, 1)
-	for ; len(queue) > 0; queue = queue[1:] {
-		cur := queue[0]
-		for dist := 1; dist <= 6 && cur+dist <= sqN; dist++ {
-			next := cur + dist
-			x, y := coord(n, next)
-			if board[y][x] != -1 {
-				next = board[y][x]
-			}
-			rolls := leastRolls[cur-1] + 1
-
-			if (next > 1 && leastRolls[next-1] == 0) || rolls < leastRolls[next-1] {
-				leastRolls[next-1] = rolls
-				if next == sqN {
-					return rolls
-				}
-				queue = append(queue, next)
-			}
-		}
-	}
-
-	l := leastRolls[sqN-1]
-	if l == 0 {
-		return -1
-	}
-	return 0
-}
-
-var _ = snakesAndLadders
diff --git a/solutions/1/q125/solution.go b/solutions/q125/solution.go
similarity index 100%
rename from solutions/1/q125/solution.go
rename to solutions/q125/solution.go
diff --git a/solutions/1/q134/solution.go b/solutions/q134/solution.go
similarity index 100%
rename from solutions/1/q134/solution.go
rename to solutions/q134/solution.go
diff --git a/solutions/1/q134/solution_test.go b/solutions/q134/solution_test.go
similarity index 100%
rename from solutions/1/q134/solution_test.go
rename to solutions/q134/solution_test.go
diff --git a/solutions/1/q135/solution.go b/solutions/q135/solution.go
similarity index 100%
rename from solutions/1/q135/solution.go
rename to solutions/q135/solution.go
diff --git a/solutions/1/q150/solution.go b/solutions/q150/solution.go
similarity index 100%
rename from solutions/1/q150/solution.go
rename to solutions/q150/solution.go
diff --git a/solutions/2/q209/solution.go b/solutions/q209/solution.go
similarity index 100%
rename from solutions/2/q209/solution.go
rename to solutions/q209/solution.go
diff --git a/solutions/2/q238/solution.go b/solutions/q238/solution.go
similarity index 100%
rename from solutions/2/q238/solution.go
rename to solutions/q238/solution.go
diff --git a/solutions/2/q238/solution_test.go b/solutions/q238/solution_test.go
similarity index 100%
rename from solutions/2/q238/solution_test.go
rename to solutions/q238/solution_test.go
diff --git a/solutions/0/q36/solution.go b/solutions/q36/solution.go
similarity index 100%
rename from solutions/0/q36/solution.go
rename to solutions/q36/solution.go
diff --git a/solutions/3/q380/solution.go b/solutions/q380/solution.go
similarity index 100%
rename from solutions/3/q380/solution.go
rename to solutions/q380/solution.go
diff --git a/tools.go b/tools.go
deleted file mode 100644
index e24a421..0000000
--- a/tools.go
+++ /dev/null
@@ -1,6 +0,0 @@
-package leetcodego
-
-import (
-	_ "github.com/emirpasic/gods/v2/utils"
-	_ "github.com/k0kubun/pp/v3"
-)