From ffc91f1f1ca6099af747c77c5cdbfc21125fc140 Mon Sep 17 00:00:00 2001
From: Luo <82520819+Jerry-306@users.noreply.github.com>
Date: Mon, 23 May 2022 10:20:08 +0800
Subject: [PATCH] =?UTF-8?q?0494.=E7=9B=AE=E6=A0=87=E5=92=8C=20=E6=96=B0?=
 =?UTF-8?q?=E5=A2=9Etypescript=E7=89=88=E6=9C=AC=E4=BB=A3=E7=A0=81?=
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---
 problems/0494.目标和.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/problems/0494.目标和.md b/problems/0494.目标和.md
index 99b76834..929b97d4 100644
--- a/problems/0494.目标和.md
+++ b/problems/0494.目标和.md
@@ -351,6 +351,28 @@ const findTargetSumWays = (nums, target) => {
 };
 ```
 
+TypeScript:
+
+```ts
+function findTargetSumWays(nums: number[], target: number): number {
+    // 把数组分成两个组合left, right.left + right = sum, left - right = target.
+    const sum: number = nums.reduce((a: number, b: number): number => a + b);
+    if ((sum + target) % 2 || Math.abs(target) > sum)  return 0;
+    const left: number = (sum + target) / 2;
+    
+    // 将问题转化为装满容量为left的背包有多少种方法
+    // dp[i]表示装满容量为i的背包有多少种方法
+    const dp: number[] = new Array(left + 1).fill(0);
+    dp[0] = 1;  // 装满容量为0的背包有1种方法（什么也不装）
+    for (let i: number = 0; i < nums.length; i++) {
+        for (let j: number = left; j >= nums[i]; j--) {
+            dp[j] += dp[j - nums[i]];
+        }
+    }
+    return dp[left];
+};
+```
+
 
 
 -----------------------