Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graf[t].size(); i++) ^ user.cpp:55:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graf[t].size(); j++) ^ user.cpp:57:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graf[t].size() && !cu_x; j++) ^ user.cpp:66:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graf[t].size() && !cu_y; j++) ^ user.cpp:76:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < graf[t].size() && !cu_z; j++) ^