Compilare: user.cpp: In function ‘void merge_it(int, int, int)’: user.cpp:35:11: warning: left operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:35:13: warning: right operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:35:16: warning: right operand of comma operator has no effect [-Wunused-value] for(i,j,poz; i<=mij&&j<=dr; poz++) ^ user.cpp:49:10: warning: statement has no effect [-Wunused-value] for(i; i<=mij; i++,poz++) ^ user.cpp:51:10: warning: statement has no effect [-Wunused-value] for(j; j<=dr; j++,poz++) ^ user.cpp: In function ‘long long int solve(int, int)’: user.cpp:83:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<f.size(); i++) ^