Compilare: user.cpp: In function ‘void merge_it(long long int, long long int, long long int)’: user.cpp:34:11: warning: left operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:34:13: warning: right operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:34:16: warning: right operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:48:10: warning: statement has no effect [-Wunused-value] for(i; i<=mij; i++,poz++) ^ user.cpp:50:10: warning: statement has no effect [-Wunused-value] for(j; j<=dr; j++,poz++) ^ user.cpp: In function ‘double solve(long long int, long long int)’: user.cpp:82:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<f.size(); i++) ^