Compilare: user.cpp: In function ‘int main(int, char**)’: user.cpp:50:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[node].size(); ++i) { ^ user.cpp:53:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (newdist < dist[target]) { ^ user.cpp:76:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << (dist[i] == -1 ? 0 : dist[i]) << " "; ^