combination sum solution

Author: yhkee0404

combination-sum/yhkee0404.ts

@@ -0,0 +1,24 @@
+function combinationSum(candidates: number[], target: number, dp = new Map()): number[][] {
+    if (target <= 0) {
+        return [];
+    }
+    let ans = dp.get(target);
+    if (ans !== undefined) {
+        return ans;
+    }
+    ans = [];
+    for (const candidate of candidates) {
+        if (target == candidate) {
+            ans.push([candidate]);
+            continue;
+        }
+        for (const combination of combinationSum(candidates, target - candidate, dp)) {
+            if (combination[combination.length - 1] > candidate) {
+                continue;
+            }
+            ans.push([...combination, candidate]);
+        }
+    }
+    dp.set(target, ans);
+    return ans;
+};