Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:19:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < in.size(); ++ i){ ^ user.cpp:32:24: warning: variable ‘val1’ set but not used [-Wunused-but-set-variable] pair<int, int> val1 = cst.front(), val2 = cdr.front(); ^ user.cpp:32:44: warning: variable ‘val2’ set but not used [-Wunused-but-set-variable] pair<int, int> val1 = cst.front(), val2 = cdr.front(); ^