func_code_string: #include <bits/stdc++.h>   using namespace std;   int sum(int[][3], int, int);   bool valid(int);   int main() {     int A[3][3];     for (int i = 0; i < 3; ++i)       for (int j = 0; j < 3; ++j) cin >> A[i][j];     for (int i = 0; i < 3; ++i) {       for (int j = 0; j < 3; ++j) cout << !(sum(A, i, j) % 2);       cout <<   n ;     }     return 0;   }   bool valid(int x) { return (x > -1 && x < 3); }   int sum(int A[][3], int i, int j) {     int s = 0, k;     for (k = -1; k < 2; ++k) {       int I = i + k;       if (valid(I)) s += A[I][j];       if (k) {         int J = j + k;         if (valid(J)) s += A[i][J];       }     }     return s;   }   