From ae8a0f29f2401c5749c700394e24ffcdc67be1fc Mon Sep 17 00:00:00 2001
From: Qi Jia <13632059+jackeyjia@users.noreply.github.com>
Date: Fri, 16 Jul 2021 22:08:38 -0700
Subject: [PATCH] add js solution for numDistinct

---
 problems/0115.不同的子序列.md | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/problems/0115.不同的子序列.md b/problems/0115.不同的子序列.md
index 62af9d0f..014eb3cd 100644
--- a/problems/0115.不同的子序列.md
+++ b/problems/0115.不同的子序列.md
@@ -222,7 +222,28 @@ class SolutionDP2:
 
 Go：
 
+Javascript:
+```javascript
+const numDistinct = (s, t) => {
+    let dp = Array.from(Array(s.length + 1), () => Array(t.length +1).fill(0));
 
+    for(let i = 0; i <=s.length; i++) {
+        dp[i][0] = 1;
+    }
+    
+    for(let i = 1; i <= s.length; i++) {
+        for(let j = 1; j<= t.length; j++) {
+            if(s[i-1] === t[j-1]) {
+                dp[i][j] = dp[i-1][j-1] + dp[i-1][j];
+            } else {
+                dp[i][j] = dp[i-1][j]
+            }
+        }
+    }
+
+    return dp[s.length][t.length];
+};
+```
 
 
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