58 lines
1.6 KiB
C++
58 lines
1.6 KiB
C++
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/**
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* File: subset_sum_i.cpp
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* Created Time: 2023-06-21
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* Author: krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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/* <20><><EFBFBD><EFBFBD><EFBFBD>㷨<EFBFBD><E3B7A8><EFBFBD>Ӽ<EFBFBD><D3BC><EFBFBD> I */
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void backtrack(vector<int> &state, int target, vector<int> &choices, int start, vector<vector<int>> &res) {
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// <20>Ӽ<EFBFBD><D3BC>͵<EFBFBD><CDB5><EFBFBD> target ʱ<><CAB1><EFBFBD><EFBFBD>¼<EFBFBD><C2BC>
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if (target == 0) {
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res.push_back(state);
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return;
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}
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><D1A1>
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// <20><>֦<EFBFBD><D6A6><EFBFBD><EFBFBD><EFBFBD><EFBFBD> start <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><D8B8>Ӽ<EFBFBD>
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for (int i = start; i < choices.size(); i++) {
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// <20><>֦һ<D6A6><D2BB><EFBFBD><EFBFBD><EFBFBD>Ӽ<EFBFBD><D3BC>ͳ<EFBFBD><CDB3><EFBFBD> target <20><><EFBFBD><EFBFBD>ֱ<EFBFBD>ӽ<EFBFBD><D3BD><EFBFBD>ѭ<EFBFBD><D1AD>
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><F2A3ACBA><EFBFBD>Ԫ<EFBFBD>ظ<EFBFBD><D8B8><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӽ<EFBFBD><D3BC><EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD> target
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if (target - choices[i] < 0) {
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break;
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}
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// <20><><EFBFBD>ԣ<EFBFBD><D4A3><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><F1A3ACB8><EFBFBD> target, start
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state.push_back(choices[i]);
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><D2BB>ѡ<EFBFBD><D1A1>
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backtrack(state, target - choices[i], choices, i, res);
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// <20><><EFBFBD>ˣ<EFBFBD><CBA3><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD>ָ<F1A3ACBB><D6B8><EFBFBD>֮ǰ<D6AE><C7B0>״̬
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state.pop_back();
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}
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}
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/* <20><><EFBFBD><EFBFBD><EFBFBD>Ӽ<EFBFBD><D3BC><EFBFBD> I */
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vector<vector<int>> subsetSumI(vector<int> &nums, int target) {
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vector<int> state; // ״̬<D7B4><CCAC><EFBFBD>Ӽ<EFBFBD><D3BC><EFBFBD>
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sort(nums.begin(), nums.end()); // <20><> nums <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int start = 0; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC>
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vector<vector<int>> res; // <20><><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD><D0B1><EFBFBD><EFBFBD>Ӽ<EFBFBD><D3BC>б<EFBFBD><D0B1><EFBFBD>
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backtrack(state, target, nums, start, res);
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return res;
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}
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/* Driver Code */
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int main() {
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vector<int> nums = {3, 4, 5};
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int target = 9;
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vector<vector<int>> res = subsetSumI(nums, target);
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cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> nums = ";
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printVector(nums);
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cout << "target = " << target << endl;
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cout << "<EFBFBD><EFBFBD><EFBFBD>к͵<EFBFBD><EFBFBD><EFBFBD> " << target << " <20><><EFBFBD>Ӽ<EFBFBD> res = " << endl;
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printVectorMatrix(res);
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return 0;
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}
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