Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:29:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[smod].size();i++){ ^ user.cpp:44:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[smod2].size();i++) ^ user.cpp:51:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[x].size();i++) ^ user.cpp:57:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<H[smod].size();i++) ^