add new solutions

solutions/1/q110/solution.go

@@ -0,0 +1,36 @@
+package q110
+
+type TreeNode struct {
+	Val   int
+	Left  *TreeNode
+	Right *TreeNode
+}
+
+func abs(a int) int {
+	if a < 0 {
+		return -a
+	}
+	return a
+}
+
+func isBalancedInternal(node *TreeNode, lvl int) (bool, int) {
+	if node == nil {
+		return true, lvl
+	}
+
+	lBal, lDpth := isBalancedInternal(node.Left, lvl+1)
+	rBal, rDpth := isBalancedInternal(node.Right, lvl+1)
+	dpth := max(lDpth, rDpth)
+
+	if !lBal || !rBal || abs(lDpth-rDpth) > 1 {
+		return false, dpth
+	}
+	return true, dpth
+}
+
+func isBalanced(root *TreeNode) bool {
+	ret, _ := isBalancedInternal(root, 0)
+	return ret
+}
+
+var _ = isBalanced