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top-100-liked/69/leetcode_test.go

@@ -5,57 +5,39 @@ import (
 	"testing"
 )
 
-// https://leetcode.cn/problems/min-stack/description/?envType=study-plan-v2&envId=top-100-liked
+// https://leetcode.cn/problems/valid-parentheses/description/?envType=study-plan-v2&envId=top-100-liked
 
-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))
+func isValid(s string) bool {
+	stack := []rune{}
+	for _, c := range s {
+		if c == '(' || c == '[' || c == '{' {
+			stack = append(stack, c)
+		} else {
+			if len(stack) == 0 {
+				return false
+			}
+			pre := stack[len(stack)-1]
+			stack = stack[:len(stack)-1]
+			if c == ')' && pre != '(' {
+				return false
+			}
+			if c == ']' && pre != '[' {
+				return false
+			}
+			if c == '}' && pre != '{' {
+				return false
+			}
+		}
 	}
-	this.slice = append(this.slice, value)
+	return len(stack) == 0
 }
 
-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())
+func Test(t *testing.T) {
+	fmt.Println(isValid("()"))
+	fmt.Println(isValid("()[]{}"))
+	fmt.Println(isValid("(]"))
+	fmt.Println(isValid("([])"))
+	fmt.Println(isValid("([)]"))
+	fmt.Println(isValid("("))
+	fmt.Println(isValid("]"))
 }