Create delete-operation-for-two-strings.cpp

Author: kamyu104

C++/delete-operation-for-two-strings.cpp

@@ -0,0 +1,19 @@
+// Time:  O(m * n)
+// Space: O(n)
+
+class Solution {
+public:
+    int minDistance(string word1, string word2) {
+        const auto m = word1.length();
+        const auto n = word2.length();
+
+        vector<vector<int>> dp(2, vector<int>(n + 1));
+        for (int i = 0; i < m; ++i) {
+            for (int j = 0; j < n; ++j) {
+                dp[(i + 1) % 2][j + 1] = max(max(dp[i % 2][j + 1], dp[(i + 1) % 2][j]),
+                                             dp[i % 2][j] + (word1[i] == word2[j]));
+            }
+        }
+        return m + n - 2 * dp[m % 2][n];
+    }
+};