combination sum solution

Author: hyer0705

combination-sum/hyer0705.ts

@@ -0,0 +1,21 @@
+function combinationSum(candidates: number[], target: number): number[][] {
+  const results: number[][] = [];
+
+  function backtrack(currentIndex: number, sum: number, selected: number[]) {
+    if (sum > target) return;
+    if (sum === target) {
+      results.push([...selected]);
+      return;
+    }
+
+    for (let i = currentIndex; i < candidates.length; i++) {
+      selected.push(candidates[i]);
+      backtrack(i, sum + candidates[i], selected);
+      selected.pop();
+    }
+  }
+
+  backtrack(0, 0, []);
+
+  return results;
+}