试题:找出数组中元素和为指定值的所有组合

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本问题来自论坛, 题意大概如下:

指定一个数组, 和一个数值, 找出数组中元素和为这个指定数值的所有组合

如指定数组元素为[1, 2, 3], 而指定数值为6, 则满足要求的组合为:{1, 2}, {3}

#include <iostream>using namespace std;void solve(int n, int data[], int start, int end,           int used[], int index, int size, bool change){    if (0 == n && change) {        for (int i = 0; i <= index; ++i) {            cout << used[i] << " ";        }        cout << endl;    }    // cause zero may in the data array, we cannot jump out now    if (start < end && index < size - 1) {if (n >= data[start]) {++index;used[index] = data[start];solve(n - data[start], data, start + 1, end, used, index, size, true);--index;}solve(n, data, start + 1, end, used, index, size, false);    }}void solve(int n, int data[], int used[], int size){    solve(n, data, 0, size, used, -1, size, false);}int main(){{cout << "------ block 1 ------" << endl;int n = 15;int data[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};int used[10]= {0};solve(n, data, used, 10);}{cout << "------ block 2 ------" << endl;int n = 15;int data[10] = {9, 8, 7, 6, 5, 4, 3, 2, 1, 0};int used[10]= {0};solve(n, data, used, 10);}    return 0;}