u

2026-07-17 14:39:23 +08:00
parent 4b12dd8f07
commit 3bd18ddaf2
3 changed files with 165 additions and 0 deletions
@@ -0,0 +1,43 @@
+package top100liked
+
+import (
+	"fmt"
+	"strings"
+	"testing"
+	"unicode"
+)
+
+// https://leetcode.cn/problems/decode-string/description/?envType=study-plan-v2&envId=top-100-liked
+
+func decodeString(s string) string {
+	curStr := ""
+	curNum := 0
+	strStack := []string{}
+	numStack := []int{}
+	for _, r := range s {
+		if unicode.IsDigit(r) {
+			curNum = curNum*10 + int(r-'0')
+		} else if unicode.IsLetter(r) {
+			curStr += string(r)
+		} else if r == '[' {
+			strStack = append(strStack, curStr)
+			curStr = ""
+			numStack = append(numStack, curNum)
+			curNum = 0
+		} else if r == ']' {
+			num := numStack[len(numStack)-1]
+			prevStr := strStack[len(strStack)-1]
+			numStack = numStack[:len(numStack)-1]
+			strStack = strStack[:len(strStack)-1]
+			curStr = prevStr + strings.Repeat(curStr, num)
+		}
+	}
+	return curStr
+}
+
+func Test(t *testing.T) {
+	fmt.Println(decodeString("3[a]2[bc]"))
+	fmt.Println(decodeString("3[a2[c]]"))
+	fmt.Println(decodeString("2[abc]3[cd]ef"))
+	fmt.Println(decodeString("abc3[cd]xyz"))
+}