Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:42:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:45:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:52:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < isgud.size(); ++i){ ^ user.cpp:57:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l = 1; l < isgud.size(); ++l) ^ user.cpp:58:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + l < isgud.size(); ++i){ ^ user.cpp:74:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph[x].size(); ++i) ^ user.cpp:79:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < isgud.size(); ++i){ ^ user.cpp:83:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int l = 1; l < isgud.size(); ++l) ^ user.cpp:84:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i + l < isgud.size(); ++i){ ^