2.生日蜡烛

#include<iostream>

using namespace std;

int main()

{

    int x,y;

    for( x=1,y=2; x<100; x++)

        for( y=x+1; (y+x)*(y-x+1) <= 472; y++)

        {

            //cout<<x<<" "<<y<<" "<<(y+x)*(y-x+1)<<endl;

            if((y+x)*(y-x+1) == 472)

            {

                cout<<x<<endl;

                return 0;

            }

        }

        return 0;

}