题解 | #尼科彻斯定理#

C++的^是异或我老是搞成幂符号，啊啊啊我去

#include <algorithm>
#include <cmath>

using namespace std;

int main() {
    int x;
    while(cin>>x){
        int start,end;
        string out;
        start = pow(x-1,2)+x;
        end = pow(x,2)+x-1;
        for(int i =start;i<=end;i+=2){
            out+=to_string(i)+'+';
        }
        if(!out.empty())out = out.erase(out.size()-1);
        cout<<out<<endl;
        
    }
}