feat: create template with problem url and code snippet

Makefile

@@ -1,4 +1,7 @@
 lint:
 	golangci-lint run ./...
 
-.PHONY: lint
+problemset:
+	bash ./query-problem-set.sh > problemset.jsonl
+
+.PHONY: lint problemset

create.sh

@@ -1,21 +1,42 @@
 #!/bin/bash
 
-num=$1
+id=$1
 
-echo "$num" | grep -q "^[1-9][0-9]\{,4\}$" || {
-    echo "Err: no valid number given" >&2
+echo "$id" | grep -q "^[1-9][0-9]\{,4\}$" || {
+    echo "Err: no valid problem ID provided." >&2
     exit 1
 }
 
-parent=$((num / 100))
-pdir="solutions/${parent}/q${num}"
+parent=$((id / 100))
+pdir="solutions/${parent}/q${id}"
 sol_file="${pdir}/solution.go"
 
 if [ -f "$sol_file" ]; then
     exit 0
 fi
 
-echo "Creating template for question No. $num" >&2
+title_slug=$(jq -r "select(.id == $id) | .titleSlug" ./problemset.jsonl)
+[ -n "$title_slug" ] || {
+    echo "Err: problem $id not found in the problem set." >&2
+    exit 1
+}
+problem_url="https://leetcode.com/problems/$title_slug/"
+
+echo -e "Creating template for problem \033[32m${id}: $title_slug\033[0m" >&2
 mkdir -pv "$pdir"
-echo "package q$num" > "$sol_file"
-echo "Created $sol_file"
+echo "// Package q$id implements a solution for $problem_url" > "$sol_file"
+echo -e "package q$id\n" >> "$sol_file"
+
+echo "Created: $sol_file"
+
+echo "Fetching code snippet for Go ..."
+curl -sSLf "${problem_url}description/" \
+    -H 'accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8' \
+    -H 'accept-language: en-US,en;q=0.5' \
+    -H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36' \
+    | grep -o 'NEXT_DATA[^>]*>.*' \
+    | sed 's/^[^>]*>//;s/<\/script.*//' \
+    | jq -r '[ .props.pageProps.dehydratedState.queries[].state.data.question.codeSnippets | select( . != null) | .[] | select(.langSlug == "golang") ][0].code' \
+        >> "$sol_file"
+
+echo "Done."

query-problem-set.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -e
+
+query() {
+    page=$1
+    offset=$((page * 100))
+
+    # shellcheck disable=SC2016
+    curl -sSLf 'https://leetcode.com/graphql/' \
+        --compressed \
+        -H 'content-type: application/json' \
+        --data-raw '{
+            "query": "\n    query problemsetQuestionListV2($filters: QuestionFilterInput, $limit: Int, $searchKeyword: String, $skip: Int, $sortBy: QuestionSortByInput, $categorySlug: String) {\n  problemsetQuestionListV2(\n    filters: $filters\n    limit: $limit\n    searchKeyword: $searchKeyword\n    skip: $skip\n    sortBy: $sortBy\n    categorySlug: $categorySlug\n  ) {\n    questions {\n      id\n      titleSlug\n      title\n      translatedTitle\n      questionFrontendId\n      paidOnly\n      difficulty\n      topicTags {\n        name\n        slug\n        nameTranslated\n      }\n      status\n      isInMyFavorites\n      frequency\n      acRate\n      contestPoint\n    }\n    totalLength\n    finishedLength\n    hasMore\n  }\n}\n    ",
+            "variables": {
+                "skip": '"$offset"',
+                "limit": 100,
+                "categorySlug": "all-code-essentials",
+                "filters": {"filterCombineType":"ALL","statusFilter":{"questionStatuses":[],"operator":"IS"},"difficultyFilter":{"difficulties":[],"operator":"IS"},"languageFilter":{"languageSlugs":[],"operator":"IS"},"topicFilter":{"topicSlugs":[],"operator":"IS"},"acceptanceFilter":{},"frequencyFilter":{},"frontendIdFilter":{},"lastSubmittedFilter":{},"publishedFilter":{},"companyFilter":{"companySlugs":[],"operator":"IS"},"positionFilter":{"positionSlugs":[],"operator":"IS"},"positionLevelFilter":{"positionLevelSlugs":[],"operator":"IS"},"contestPointFilter":{"contestPoints":[],"operator":"IS"},"premiumFilter":{"premiumStatus":[],"operator":"IS"}},
+                "searchKeyword": "",
+                "sortBy": {"sortField":"CUSTOM","sortOrder":"ASCENDING"},
+                "filtersV2": {"filterCombineType":"ALL","statusFilter":{"questionStatuses":[],"operator":"IS"},"difficultyFilter":{"difficulties":[],"operator":"IS"},"languageFilter":{"languageSlugs":[],"operator":"IS"},"topicFilter":{"topicSlugs":[],"operator":"IS"},"acceptanceFilter":{},"frequencyFilter":{},"frontendIdFilter":{},"lastSubmittedFilter":{},"publishedFilter":{},"companyFilter":{"companySlugs":[],"operator":"IS"},"positionFilter":{"positionSlugs":[],"operator":"IS"},"positionLevelFilter":{"positionLevelSlugs":[],"operator":"IS"},"contestPointFilter":{"contestPoints":[],"operator":"IS"},"premiumFilter":{"premiumStatus":[],"operator":"IS"}}
+            },
+            "operationName": "problemsetQuestionListV2"
+        }' | jq -c '.data.problemsetQuestionListV2.questions[] | { id, title, titleSlug, difficulty, paidOnly, tags: [ .topicTags[] | .slug ] }'
+}
+
+page=0
+while true; do
+    echo -ne "  Querying page $((page + 1)) ...\r" >&2
+    content=$(query $page)
+    lines=$(echo "$content" | wc -l)
+    echo "$content"
+
+    [ "$lines" -lt 100 ] && break
+    page=$((page + 1))
+done | jq -s -c 'sort_by(.id) | .[]'
+echo >&2