Compilare: user.cpp: In function ‘void Bellman_Ford()’: user.cpp:56:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[now].size();i++){ ^ user.cpp: In function ‘int main()’: user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.in","r",stdin); ^ user.cpp:25:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bellmanford.out","w",stdout); ^