Update 72-edit-distance.js

Author: everthis

72-edit-distance.js

@@ -23,3 +23,32 @@ const minDistance = function(word1, word2) {
     }
     return dp[m][n];
 };
+
+// another
+
+/**
+ * @param {string} word1
+ * @param {string} word2
+ * @return {number}
+ */
+const minDistance = function(word1, word2) {
+  const m = word1.length, n = word2.length
+  const dp = Array(n + 1).fill(0)
+  for(let i = 1; i <= n; i++) dp[i] = i 
+  let pre = 0
+  for(let i = 1; i <= m; i++) {
+    pre = dp[0]
+    dp[0] = i
+    for(let j = 1; j <= n; j++) {
+      let tmp = dp[j]
+      if(word1[i - 1] === word2[j - 1]) {
+        dp[j] = pre
+      } else {
+        dp[j] = Math.min(pre, dp[j],  dp[j - 1]) + 1
+      }
+      pre = tmp
+    }
+  }
+
+  return dp[n]
+};