题解 | #数组分组#

#include<iostream>
#include<cmath>
#include<vector>
using namespace std;
int des5_3=0;
vector<int>vec;
bool dfs(int i,int des)
{
    if(i==vec.size())
    {
        return abs(des)==des5_3;
    }
    else
    {
        return dfs(i+1,des+vec[i])||dfs(i+1,des-vec[i]);
    }
}
int main()
{
    int c;
    while(cin>>c)
    {
        vec.clear();
        int sum3=0;
        int sum5=0;
        while(c--)
        {
            int data;
            cin>>data;
            if(data%3==0)
            {
                sum3+=data;
            }
            else if(data%5==0)
            {
                sum5+=data;
            }
            else
            {
               vec.push_back(data); 
            }
        }
        des5_3=abs(sum5-sum3);
        if(dfs(0,0))
        {
            cout<<"true"<<endl;
        }
        else
        {
            cout<<"false"<<endl;
        }
    }
    return 0;
}