diff --git a/problems/1049.最后一块石头的重量II.md b/problems/1049.最后一块石头的重量II.md
index 3d256c3d..f3e7909c 100644
--- a/problems/1049.最后一块石头的重量II.md
+++ b/problems/1049.最后一块石头的重量II.md
@@ -277,26 +277,29 @@ var lastStoneWeightII = function (stones) {
 };
 ```
 
-TypeScript：
 
-```typescript
+TypeScript版本
+
+```ts
 function lastStoneWeightII(stones: number[]): number {
-    const sum: number = stones.reduce((pre, cur) => pre + cur);
-    const bagSize: number = Math.floor(sum / 2);
-    const weightArr: number[] = stones;
-    const valueArr: number[] = stones;
-    const goodsNum: number = weightArr.length;
-    const dp: number[] = new Array(bagSize + 1).fill(0);
-    for (let i = 0; i < goodsNum; i++) {
-        for (let j = bagSize; j >= weightArr[i]; j--) {
-            dp[j] = Math.max(dp[j], dp[j - weightArr[i]] + valueArr[i]);
+    const sum: number = stones.reduce((a: number, b:number): number => a + b);
+    const target: number = Math.floor(sum / 2);
+    const n: number = stones.length;
+    // dp[j]表示容量（总数和）为j的背包所能装下的数（下标[0, i]之间任意取）的总和（<= 容量）的最大值
+    const dp: number[] = new Array(target + 1).fill(0);
+    for (let i: number = 0; i < n; i++ ) {
+        for (let j: number = target; j >= stones[i]; j--) {
+            dp[j] = Math.max(dp[j], dp[j - stones[i]] + stones[i]);
         }
     }
-    return sum - dp[bagSize] * 2;
+    return sum - dp[target] - dp[target];
 };
 ```
 
 
 
+
+
+
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 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>