Compilare: user.cpp: In function ‘int main()’: user.cpp:69:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=t;i++) ^ user.cpp:87:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=n;j++) ^ user.cpp:72:20: warning: unused variable ‘s’ [-Wunused-variable] unsigned long long s=0; ^