Compilare: user.cpp: In function ‘void solve(int, int)’: user.cpp:76:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < in.size(); ++ i){ ^ user.cpp:89:24: warning: variable ‘val1’ set but not used [-Wunused-but-set-variable] pair<int, int> val1 = cst.front(), val2 = cdr.front(); ^ user.cpp:89:44: warning: variable ‘val2’ set but not used [-Wunused-but-set-variable] pair<int, int> val1 = cst.front(), val2 = cdr.front(); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:19:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^