/*start time = 16:57end time = 17:15*/#include <iostream>#include <stdlib.h>using namespace std;//由小到大排int cmp(const void * a, const void * b){    return *((int *)a) - *((int *)b);}bool get_TwoNumber(int * a, int len, int sum){    int i, j;    qsort(a, len, sizeof(a[0]), cmp);    for(i = 0, j = len - 1; i < j;)    {        if(a[i] + a[j] == sum)        {            cout << a[i] << " + " << a[j] << " = "<< sum << endl;            return true;        }        else if(a[i] + a[j] < sum)        {            i++;        }        else        {            j--;        }    }    cout << "no vaild num!" << endl;    return false;}int main(){    int a[10] = {5,6,1,4,7,9,8};    get_TwoNumber(a, 7, 10);    return 0;}