添加 problem 350

Algorithms/350. Intersection of Two Arrays II/350. Intersection of Two Arrays II.go

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+package leetcode
+
+func intersect(nums1 []int, nums2 []int) []int {
+	m := map[int]int{}
+	var res []int
+	for _, n := range nums1 {
+		m[n]++
+	}
+	for _, n := range nums2 {
+		if m[n] > 0 {
+			res = append(res, n)
+			m[n]--
+		}
+	}
+	return res
+}

Algorithms/350. Intersection of Two Arrays II/350. Intersection of Two Arrays II_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question350 struct {
+	para350
+	ans350
+}
+
+// para 是参数
+// one 代表第一个参数
+type para350 struct {
+	one     []int
+	another []int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans350 struct {
+	one []int
+}
+
+func Test_Problem350(t *testing.T) {
+
+	qs := []question350{
+
+		question350{
+			para350{[]int{}, []int{}},
+			ans350{[]int{}},
+		},
+
+		question350{
+			para350{[]int{1}, []int{1}},
+			ans350{[]int{1}},
+		},
+
+		question350{
+			para350{[]int{1, 2, 3, 4}, []int{1, 2, 3, 4}},
+			ans350{[]int{1, 2, 3, 4}},
+		},
+
+		question350{
+			para350{[]int{1, 2, 2, 1}, []int{2, 2}},
+			ans350{[]int{2, 2}},
+		},
+
+		question350{
+			para350{[]int{1}, []int{9, 9, 9, 9, 9}},
+			ans350{[]int{}},
+		},
+
+		question350{
+			para350{[]int{4, 9, 5}, []int{9, 4, 9, 8, 4}},
+			ans350{[]int{9, 4}},
+		},
+
+		question350{
+			para350{[]int{4, 9, 5, 9, 4}, []int{9, 4, 9, 8, 4, 7, 9, 4, 4, 9}},
+			ans350{[]int{9, 4, 9, 4}},
+		},
+		// 如需多个测试，可以复制上方元素。
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 350------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans350, q.para350
+		fmt.Printf("【input】:%v       【output】:%v\n", p, intersect(p.one, p.another))
+	}
+	fmt.Printf("\n\n\n")
+}

Algorithms/350. Intersection of Two Arrays II/README.md

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+# [350. Intersection of Two Arrays II](https://leetcode.com/problems/intersection-of-two-arrays-ii/)
+
+## 题目
+
+Given two arrays, write a function to compute their intersection.
+
+
+
+Example 1:
+
+```c
+Input: nums1 = [1,2,2,1], nums2 = [2,2]
+Output: [2,2]
+```
+
+Example 2:
+
+```c
+Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]
+Output: [4,9]
+```
+
+Note:
+
+- Each element in the result should appear as many times as it shows in both arrays.
+- The result can be in any order.
+
+
+Follow up:
+
+- What if the given array is already sorted? How would you optimize your algorithm?
+- What if nums1's size is small compared to nums2's size? Which algorithm is better?
+- What if elements of nums2 are stored on disk, and the memory is limited such that you cannot load all elements into the memory at once?
+
+## 题目大意
+
+这题是第 349 题的加强版。要求输出 2 个数组的交集元素，如果元素出现多次，要输出多次。
+
+这一题还是延续第 349 题的思路。把数组一中的数字都放进字典中，另外字典的 key 是数组中的数字，value 是这个数字出现的次数。在扫描数组二的时候，每取出一个存在的数组，把字典中的 value 减一。如果 value 是 0 代表不存在这个数字。
+
+
+