概述
给定一个整数数组和一个目标数，目的是要从整数数组中找出与目标数相加的组合数目。
数组中的每个元素都可以在相同的组合中使用任意次数。
例子
Input: [3,4,10,11]
Target: 10
Output: [[3,3,4],[10]]
程序
以下是相同的程序。
package main
import "fmt"
func combinationSum(candidates []int, target int) [][]int {
lengthCandidates := len(candidates)
current_sum_array := make([]int, 0)
output := make([][]int, 0)
combinationSumUtil(candidates, lengthCandidates, 0, 0, 0, target, current_sum_array, &output)
return output
}
func combinationSumUtil(candidates []int, lengthCandidates, index, current_sum_index, current_sum, target int, current_sum_array []int, output *[][]int) {
if index >= lengthCandidates {
return
}
if current_sum > target {
return
}
if current_sum == target {
var o []int
for i := 0; i < current_sum_index; i++ {
o = append(o, current_sum_array[i])
}
*output = append(*output, o)
return
}
//Exclude
combinationSumUtil(candidates, lengthCandidates, index+1, current_sum_index, current_sum, target, current_sum_array, output)
//Include
current_sum_array = append(current_sum_array, candidates[index])
combinationSumUtil(candidates, lengthCandidates, index, current_sum_index+1, current_sum+candidates[index], target, current_sum_array, output)
}
func main() {
output := combinationSum([]int{3, 4, 10, 11}, 10)
fmt.Println(output)
}
输出
[[10] [3 3 4]]
