From 832edfa6926ab9d88cb14684019618b63ce0c099 Mon Sep 17 00:00:00 2001
From: SquidSpirit <squid@squidspirit.com>
Date: Thu, 27 Feb 2025 23:41:47 +0800
Subject: [PATCH] feat: 39_combination_sum_1

---
 39_combination_sum_1/main.cpp | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 39_combination_sum_1/main.cpp

diff --git a/39_combination_sum_1/main.cpp b/39_combination_sum_1/main.cpp
new file mode 100644
index 0000000..d3d25ab
--- /dev/null
+++ b/39_combination_sum_1/main.cpp
@@ -0,0 +1,34 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+   public:
+    vector<vector<int>> combinationSum(vector<int>& candidates, int target) {
+        sort(candidates.begin(), candidates.end());
+
+        vector<vector<int>> result;
+
+        function<void(int, vector<int>)> recursive = [&](int target, vector<int> chosen) {
+            if (target < 0) return;
+            
+            if (target == 0) {
+                result.emplace_back(chosen);
+                return;
+            }
+
+            for (auto x : candidates) {
+                if (chosen.size() > 0 && x > chosen.back()) {
+                    return;
+                }
+
+                chosen.emplace_back(x);
+                recursive(target - x, chosen);
+                chosen.pop_back();
+            }
+        };
+
+        recursive(target, {});
+
+        return result;
+    }
+};