1 files changed, 22 insertions, 0 deletions

diff --git a/03_dynamic_programming/edit_distance_1639.cpp b/03_dynamic_programming/edit_distance_1639.cpp
new file mode 100644
index 0000000..0d8c6ef
--- /dev/null
+++ b/03_dynamic_programming/edit_distance_1639.cpp
@@ -0,0 +1,22 @@
+#include <algorithm>
+#include <iostream>
+#include <string>
+#include <vector>
+
+int d(const std::string& a, const std::string& b, size_t i, size_t j,
+    std::vector<std::vector<int>>& t) {
+        if (t[i][j] != -1) return t[i][j];
+        if (i == a.size()) return t[i][j] = b.size()-j;
+        if (j == b.size()) return t[i][j] = a.size()-i;
+        if (a[i] == b[j]) return t[i][j] = d(a, b, i+1, j+1, t);
+        return t[i][j] = 1+std::min(d(a, b, i+1, j+1, t),
+            std::min(d(a, b, i+1, j, t), d(a, b, i, j+1, t)));
+}
+
+int main() {
+        std::string a, b;
+        std::cin >> a >> b;
+        std::vector<std::vector<int>>
+            t(a.size()+1, std::vector<int>(b.size()+1, -1));
+        std::cout << d(a, b, 0, 0, t) << "\n";
+}