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很單純的程式碼，怎會 SE

#include <iostream>

#include <iomanip>

using namespace std;

int main() {

int n,nn, i,R,G,B;

double X,Y,Z,sum;

while(cin >> n)

{

nn=n*n;  sum=0;

for(i=0;i<nn;i++)

{

cin >> R >> G >> B;

X = 0.5149 * R + 0.3244 * G + 0.1607 * B ;

Y = 0.2654 * R + 0.6704 * G + 0.0642 * B ;

Z = 0.0248 * R + 0.1248 * G + 0.8504 * B ;

sum += Y;

cout  << fixed << setprecision(4) << X << " " << Y << " " << Z << endl;

}

cout << "The average of Y is " << sum/nn << endl;

}

return 0;

}