From ae8598a2b154253a9f7627579eb2867ef0cc10d0 Mon Sep 17 00:00:00 2001
From: SquidSpirit <squid@squidspirit.com>
Date: Fri, 28 Feb 2025 00:52:14 +0800
Subject: [PATCH] feat: 40_combination_sum_2

---
 40_combination_sum_2/main.cpp | 43 +++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 40_combination_sum_2/main.cpp

diff --git a/40_combination_sum_2/main.cpp b/40_combination_sum_2/main.cpp
new file mode 100644
index 0000000..15da8c1
--- /dev/null
+++ b/40_combination_sum_2/main.cpp
@@ -0,0 +1,43 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+class Solution {
+   public:
+    vector<vector<int>> combinationSum2(vector<int>& candidates, int target) {
+        vector<vector<int>> result;
+
+        sort(candidates.begin(), candidates.end());
+
+        function<void(int, vector<int>, int)> recursive = [&](int target, vector<int> chosen, int startIndex) {
+            if (target == 0) {
+                result.emplace_back(chosen);
+                return;
+            }
+
+            for (int i = startIndex; i < candidates.size(); i++) {
+                int x = candidates[i];
+
+                if (i > startIndex && x == candidates[i - 1]) {
+                    continue;
+                }
+
+                if (target < x) return;
+
+                chosen.emplace_back(x);
+                recursive(target - x, chosen, i + 1);
+                chosen.pop_back();
+            }
+        };
+
+        recursive(target, {}, 0);
+
+        return result;
+    }
+};
+
+int main() {
+    vector<int> v{10, 1, 2, 7, 6, 1, 5};
+    Solution().combinationSum2(v, 8);
+
+    return 0;
+}