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38 lines
1.2 KiB
Go
38 lines
1.2 KiB
Go
// File: subset_sum_i_naive.go
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// Created Time: 2023-06-24
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// Author: Reanon (793584285@qq.com)
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package chapter_backtracking
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/* 回溯算法：子集和 I */
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func backtrackSubsetSumINaive(total, target int, state, choices *[]int, res *[][]int) {
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// 子集和等于 target 时，记录解
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if target == total {
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newState := append([]int{}, *state...)
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*res = append(*res, newState)
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return
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}
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// 遍历所有选择
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for i := 0; i < len(*choices); i++ {
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// 剪枝：若子集和超过 target ，则跳过该选择
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if total+(*choices)[i] > target {
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continue
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}
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// 尝试：做出选择，更新元素和 total
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*state = append(*state, (*choices)[i])
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// 进行下一轮选择
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backtrackSubsetSumINaive(total+(*choices)[i], target, state, choices, res)
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// 回退：撤销选择，恢复到之前的状态
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*state = (*state)[:len(*state)-1]
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}
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}
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/* 求解子集和 I（包含重复子集） */
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func subsetSumINaive(nums []int, target int) [][]int {
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state := make([]int, 0) // 状态（子集）
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total := 0 // 子集和
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res := make([][]int, 0) // 结果列表（子集列表）
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backtrackSubsetSumINaive(total, target, &state, &nums, &res)
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return res
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}
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