Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:163:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v[node].size(); ++i) { ^ user.cpp:166:17: warning: variable ‘qweqw’ set but not used [-Wunused-but-set-variable] int qweqw = v[node][i].se; ^ user.cpp: In function ‘void solve(int, int)’: user.cpp:196:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = lst[x]; i < v[x].size(); ++i) { ^ user.cpp:210:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v[x].size()) { ^ user.cpp:219:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = lst[y]; i < v[y].size(); ++i) { ^ user.cpp:233:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == v[y].size()) { ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:31:38: 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); ^