Compilare: main.cpp: In function 'int main()': main.cpp:2:97: warning: unused variable 'm' [-Wunused-variable] using namespace std;ifstream in("bunicu.in");ofstream out("bunicu.out");int main(){char k;int n,m,i,j,t,d,r;in>>t;for(i=1;i<=t;i++,out<<'\n'){in>>n;for(j=1;j<=n;j++)for(d=1;d<=n;d++){in>>k;if(d==j)out<<0-(k-'0'-1);;}}return 0;} ^ main.cpp:2:107: warning: unused variable 'r' [-Wunused-variable] using namespace std;ifstream in("bunicu.in");ofstream out("bunicu.out");int main(){char k;int n,m,i,j,t,d,r;in>>t;for(i=1;i<=t;i++,out<<'\n'){in>>n;for(j=1;j<=n;j++)for(d=1;d<=n;d++){in>>k;if(d==j)out<<0-(k-'0'-1);;}}return 0;} ^