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top-100-liked/70/leetcode_test.go

@@ -2,42 +2,60 @@ package top100liked
 
 import (
 	"fmt"
-	"strings"
 	"testing"
-	"unicode"
 )
 
-// https://leetcode.cn/problems/decode-string/description/?envType=study-plan-v2&envId=top-100-liked
+// https://leetcode.cn/problems/min-stack/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)
-		}
+type MinStack struct {
+	slice    []int
+	minSlice []int // 记录每个层级的最小值
+}
+
+func Constructor() MinStack {
+	return MinStack{}
+}
+
+func (this *MinStack) Push(value int) {
+	if len(this.slice) == 0 {
+		this.minSlice = append(this.minSlice, value)
+	} else {
+		this.minSlice = append(this.minSlice, min(this.minSlice[len(this.minSlice)-1], value))
 	}
-	return curStr
+	this.slice = append(this.slice, value)
 }
 
-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"))
+func (this *MinStack) Pop() {
+	this.slice = this.slice[:len(this.slice)-1]
+	this.minSlice = this.minSlice[:len(this.minSlice)-1]
+}
+
+func (this *MinStack) Top() int {
+	return this.slice[len(this.slice)-1]
+}
+
+func (this *MinStack) GetMin() int {
+	return this.minSlice[len(this.minSlice)-1]
+}
+
+func Test1(t *testing.T) {
+	minStack := Constructor()
+	minStack.Push(-2)
+	minStack.Push(0)
+	minStack.Push(-3)
+	fmt.Println(minStack.GetMin())
+	minStack.Pop()
+	fmt.Println(minStack.Top())
+	fmt.Println(minStack.GetMin())
+}
+
+func Test2(t *testing.T) {
+	minStack := Constructor()
+	minStack.Push(1)
+	minStack.Push(2)
+	fmt.Println(minStack.Top())
+	fmt.Println(minStack.GetMin())
+	minStack.Pop()
+	fmt.Println(minStack.GetMin())
+	fmt.Println(minStack.Top())
 }