Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:21:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[c[start]].size(); j++) ^ user.cpp: In function ‘void DFS(int, int)’: user.cpp:32:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod2].size(); i++) ^ user.cpp:49:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<a.size(); j++) ^ user.cpp:55:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1; j<a.size(); j++) ^