Compilare: user.cpp: In function ‘int bfs(int, int)’: user.cpp:32:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[currentNode].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:101:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0 ; j < s.size() ; ++ j) ^ user.cpp:120:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int j = 0 ; j < graph[i].size() ; ++ j) ^