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@@ -0,0 +1,64 @@
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+#include <string>
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+
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+using std::string;
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+
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+/* BEGIN */
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+
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+#include <cstring>
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+#include <algorithm>
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+
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+using std::min;
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+
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+#define L 1000
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+#define INF 1e8
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+
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+int dp[L + 1][L + 1];
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+
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+class Solution {
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+public:
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+ int minimumDeleteSum(string s1, string s2) {
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+ memset(dp, 0, sizeof(dp));
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+ for (int i = 1; i <= s1.size(); i++) { // The boundary is very important!
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+ dp[i][0] = dp[i - 1][0] + s1.at(i - 1);
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+ }
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+ for (int j = 1; j <= s2.size(); j++) {
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+ dp[0][j] = dp[0][j - 1] + s2.at(j - 1);
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+ }
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+ for (int i = 1; i <= s1.size(); i++) {
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+ for (int j = 1; j <= s2.size(); j++) {
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+ int c1 = s1.at(i - 1), c2 = s2.at(j - 1);
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+ int cost = min(dp[i - 1][j] + c1, dp[i][j - 1] + c2);
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+ if (c1 == c2) {
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+ dp[i][j] = min(dp[i - 1][j - 1], cost);
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+ } else {
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+ dp[i][j] = min(dp[i - 1][j - 1] + c1 + c2, cost);
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+ }
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+ }
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+ }
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+ return dp[s1.size()][s2.size()];
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+ }
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+};
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+
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+/* END */
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+
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+#include <iostream>
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+
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+using std::cout; using std::endl;
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+
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+int main() {
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+ string s1 = "delete";
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+ string s2 = "leet";
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+ Solution *sol = new Solution();
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+ int ans = sol->minimumDeleteSum(s1, s2);
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+ cout << s1 << " vs " << s2 << ": " << ans << endl;
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+
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+ s1 = "sea";
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+ s2 = "eat";
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+ ans = sol->minimumDeleteSum(s1, s2);
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+ cout << s1 << " vs " << s2 << ": " << ans << endl;
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+
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+ s1 = "a";
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+ s2 = "at";
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+ ans = sol->minimumDeleteSum(s1, s2);
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+ cout << s1 << " vs " << s2 << ": " << ans << endl;
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+}
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