Merge pull request youngyangyang04#1207 from xiaofei-2020/greed03

添加（0376.摆动序列.md）：增加typescript版本

Author: youngyangyang04

problems/0376.摆动序列.md

@@ -298,5 +298,55 @@ var wiggleMaxLength = function(nums) {
 };
 ```
 
+### TypeScript
+
+**贪心**
+
+```typescript
+function wiggleMaxLength(nums: number[]): number {
+    let length: number = nums.length;
+    if (length <= 1) return length;
+    let preDiff: number = 0;
+    let curDiff: number = 0;
+    let count: number = 1;
+    for (let i = 1; i < length; i++) {
+        curDiff = nums[i] - nums[i - 1];
+        if (
+            (preDiff <= 0 && curDiff > 0) ||
+            (preDiff >= 0 && curDiff < 0)
+        ) {
+            preDiff = curDiff;
+            count++;
+        }
+    }
+    return count;
+};
+```
+
+**动态规划**
+
+```typescript
+function wiggleMaxLength(nums: number[]): number {
+    const length: number = nums.length;
+    if (length <= 1) return length;
+    const dp: number[][] = new Array(length).fill(0).map(_ => []);
+    dp[0][0] = 1;   // 第一个数作为波峰
+    dp[0][1] = 1;   // 第一个数作为波谷
+    for (let i = 1; i < length; i++) {
+        dp[i][0] = 1;
+        dp[i][1] = 1;
+        for (let j = 0; j < i; j++) {
+            if (nums[j] < nums[i]) dp[i][0] = Math.max(dp[i][0], dp[j][1] + 1);
+        }
+        for (let j = 0; j < i; j++) {
+            if (nums[j] > nums[i]) dp[i][1] = Math.max(dp[i][1], dp[j][0] + 1);
+        }
+    }
+    return Math.max(dp[length - 1][0], dp[length - 1][1]);
+};
+```
+
+
+
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