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top-100-liked/67/leetcode_test.go

@@ -0,0 +1,40 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/median-of-two-sorted-arrays/?envType=study-plan-v2&envId=top-100-liked
+
+func findMedianSortedArrays(nums1 []int, nums2 []int) float64 {
+	total := len(nums1) + len(nums2)
+	mid := total / 2
+	needAvg := total%2 == 0
+	c1, c2 := 0, 0
+	prev, cur := 0, 0
+	for i := 0; i <= mid; i++ {
+		prev = cur
+		if c1 < len(nums1) && (c2 >= len(nums2) || nums1[c1] <= nums2[c2]) {
+			cur = nums1[c1]
+			c1++
+		} else {
+			cur = nums2[c2]
+			c2++
+		}
+	}
+	if needAvg {
+		return float64(prev+cur) / 2
+	}
+	return float64(cur)
+}
+
+func Test(t *testing.T) {
+	// fmt.Println(findMedianSortedArrays([]int{1, 3}, []int{2}))
+	// fmt.Println(findMedianSortedArrays([]int{1, 2}, []int{3, 4}))
+	// fmt.Println(findMedianSortedArrays([]int{}, []int{1}))
+	// fmt.Println(findMedianSortedArrays([]int{}, []int{2, 3}))
+	// fmt.Println(findMedianSortedArrays([]int{1, 2, 3, 4, 5}, []int{6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17}))
+	// fmt.Println(findMedianSortedArrays([]int{1, 2}, []int{-1, 3}))
+	fmt.Println(findMedianSortedArrays([]int{2, 2, 2, 2}, []int{2, 2, 2}))
+}

top-100-liked/68/leetcode_test.go

@@ -0,0 +1,43 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/valid-parentheses/description/?envType=study-plan-v2&envId=top-100-liked
+
+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
+			}
+		}
+	}
+	return len(stack) == 0
+}
+
+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("]"))
+}

top-100-liked/69/leetcode_test.go

@@ -0,0 +1,61 @@
+package top100liked
+
+import (
+	"fmt"
+	"testing"
+)
+
+// https://leetcode.cn/problems/min-stack/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))
+	}
+	this.slice = append(this.slice, value)
+}
+
+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())
+}