Create 2896-apply-operations-to-make-two-strings-equal.js

Author: everthis

2896-apply-operations-to-make-two-strings-equal.js

@@ -0,0 +1,39 @@
+/**
+ * @param {string} s1
+ * @param {string} s2
+ * @param {number} x
+ * @return {number}
+ */
+const minOperations = function(s1, s2, x) {
+    const diffs = [];
+    for (let i = 0; i < s1.length; i++) {
+        if (s1[i] !== s2[i]) {
+            diffs.push(i);
+        }
+    }
+
+    if (diffs.length % 2 === 1) {
+        return -1;
+    }
+
+    const cache = new Map();
+    function bestCostUpTo(i) {
+        if (i === 0) {
+            return x / 2;
+        }
+        if (i === -1) {
+            return 0;
+        }
+        if (cache.has(i)) {
+            return cache.get(i);
+        }
+        const cost = Math.min(
+            bestCostUpTo(i - 1) + x / 2,
+            bestCostUpTo(i - 2) + diffs[i] - diffs[i - 1]
+        );
+        cache.set(i, cost);
+        return cost;
+    }
+
+    return Math.floor(bestCostUpTo(diffs.length - 1));
+};