34 lines
784 B
C++
34 lines
784 B
C++
#include <vector>
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#include <cstdio>
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class Solution {
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public:
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static std::vector<std::vector<int>> combinationSum(const std::vector<int>& candidates, int target, int prev = 0) {
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std::vector<std::vector<int>> ret;
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for (int v : candidates) {
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if (v >= prev && target - v >= v) {
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std::vector<std::vector<int>> t = combinationSum(candidates, target - v, v);
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for (std::vector<int>& i : t) {
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i.push_back(v);
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}
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ret.reserve(ret.size() + t.size());
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ret.insert(ret.end(), t.begin(), t.end());
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} else if (v == target) {
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ret.emplace_back(1, v);
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}
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}
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return ret;
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}
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};
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int main() {
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auto ret = Solution::combinationSum({2, 3, 5}, 8);
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for (const auto& i : ret) {
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for (auto j : i) {
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std::printf("%d ", j);
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}
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std::printf("\n");
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}
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return 0;
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}
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