edit-distance

Author: masx200

README.md

@@ -49,6 +49,8 @@ Step 2. Add the dependency
 
 <summary>展开查看</summary>
 
+https://leetcode-cn.com/problems/edit-distance/
+
 https://leetcode.cn/problems/count-prefixes-of-a-given-string
 
 https://leetcode.cn/problems/minimum-operations-to-reduce-x-to-zero/

edit-distance/index.ts

@@ -0,0 +1,31 @@
+function minDistance(word1: string, word2: string): number {
+    const dp: number[][] = Array.from(Array(word1.length + 1), () =>
+        Array(word2.length + 1).fill(0)
+    );
+
+    for (let i = 1; i <= word1.length; i++) {
+        dp[i][0] = i;
+    }
+
+    for (let j = 1; j <= word2.length; j++) {
+        dp[0][j] = j;
+    }
+
+    for (let i = 1; i <= word1.length; i++) {
+        for (let j = 1; j <= word2.length; j++) {
+            if (word1[i - 1] === word2[j - 1]) {
+                dp[i][j] = dp[i - 1][j - 1];
+            } else {
+                dp[i][j] = Math.min(
+                    dp[i - 1][j] + 1,
+                    dp[i][j - 1] + 1,
+                    dp[i - 1][j - 1] + 1
+                );
+            }
+        }
+    }
+
+    return dp[word1.length][word2.length];
+}
+
+export default minDistance;