May 30, 2022 · May 11, 2022 · May 11, 2022 · May 11, 2022 · May 12, 2022 · May 12, 2022
diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md
diff --git a/problems/0202.快乐数.md b/problems/0202.快乐数.md
diff --git a/problems/0242.有效的字母异位词.md b/problems/0242.有效的字母异位词.md
diff --git a/problems/0349.两个数组的交集.md b/problems/0349.两个数组的交集.md
diff --git a/problems/0383.赎金信.md b/problems/0383.赎金信.md
diff --git a/problems/0454.四数相加II.md b/problems/0454.四数相加II.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -274,6 +274,24 @@ class Solution {
		}
		}
		```
	C#:
	```csharp
	public class Solution {
	public int[] TwoSum(int[] nums, int target) {
	Dictionary<int ,int> dic= new Dictionary<int,int>();
	for(int i=0;i<nums.Length;i++){
	int imp= target-nums[i];
	if(dic.ContainsKey(imp)&&dic[imp]!=i){
	return new int[]{i, dic[imp]};
	}
	if(!dic.ContainsKey(nums[i])){
	dic.Add(nums[i],i);
	}
	}
	return new int[]{0, 0};
	}
	}
	```

		-----------------------
		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
Original file line number	Diff line number	Diff line change
Expand Up		@@ -385,5 +385,28 @@ bool isHappy(int n){
		return bHappy;
		}
		```

	C#:
	```csharp
	public class Solution {
	private int getSum(int n) {
	int sum = 0;
	//每位数的换算
	while (n > 0) {
	sum += (n % 10) * (n % 10);
	n /= 10;
	}
	return sum;
	}
	public bool IsHappy(int n) {
	HashSet <int> set = new HashSet<int>();
	while(n != 1 && !set.Contains(n)) { //判断避免循环
	set.Add(n);
	n = getSum(n);
	}
	return n == 1;
	}
	}
	```
		-----------------------
		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
Original file line number	Diff line number	Diff line change
Expand Up		@@ -307,6 +307,25 @@ impl Solution {
		}
		}
		```

	C#:
	```csharp
	public bool IsAnagram(string s, string t) {
	int sl=s.Length,tl=t.Length;
	if(sl!=tl) return false;
	int[] a = new int[26];
	for(int i = 0; i < sl; i++){
	a[s[i] - 'a']++;
	a[t[i] - 'a']--;
	}
	foreach (int i in a)
	{
	if (i != 0)
	return false;
	}
	return true;
	}
	```
		## 相关题目

		* 383.赎金信
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -313,6 +313,24 @@ int* intersection1(int* nums1, int nums1Size, int* nums2, int nums2Size, int* re
		}
		```

	C#:
	```csharp
	public int[] Intersection(int[] nums1, int[] nums2) {
	if(nums1==null\|\|nums1.Length==0\|\|nums2==null\|\|nums1.Length==0)
	return new int[0]; //注意数组条件
	HashSet<int> one = Insert(nums1);
	HashSet<int> two = Insert(nums2);
	one.IntersectWith(two);
	return one.ToArray();
	}
	public HashSet<int> Insert(int[] nums){
	HashSet<int> one = new HashSet<int>();
	foreach(int num in nums){
	one.Add(num);
	}
	return one;
	}
	```
		## 相关题目

		* 350.两个数组的交集 II
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -363,5 +363,22 @@ impl Solution {
		}
		```

	C#:
	```csharp
	public bool CanConstruct(string ransomNote, string magazine) {
	if(ransomNote.Length > magazine.Length) return false;
	int[] letters = new int[26];
	foreach(char c in magazine){
	letters[c-'a']++;
	}
	foreach(char c in ransomNote){
	letters[c-'a']--;
	if(letters[c-'a']<0){
	return false;
	}
	}
	return true;
	}
	```
		-----------------------
		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
Original file line number	Diff line number	Diff line change
Expand Up		@@ -318,5 +318,32 @@ impl Solution {
		}
		```

	C#:
	```csharp
	public int FourSumCount(int[] nums1, int[] nums2, int[] nums3, int[] nums4) {
	Dictionary<int, int> dic = new Dictionary<int, int>();
	foreach(var i in nums1){
	foreach(var j in nums2){
	int sum = i + j;
	if(dic.ContainsKey(sum)){
	dic[sum]++;
	}else{
	dic.Add(sum, 1);
	}

	}
	}
	int res = 0;
	foreach(var a in nums3){
	foreach(var b in nums4){
	int sum = a+b;
	if(dic.TryGetValue(-sum, out var result)){
	res += result;
	}
	}
	}
	return res;
	}
	```
		-----------------------
		<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>