Compilare: user.cpp: In member function ‘void GRAPH::Dijkstra(int, std::vector<int>&)’: user.cpp:44:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<graph[nod.first].size(); i++) ^ user.cpp:64:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<dist.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:72:42: 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:73:44: 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); ^ user.cpp:75:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:82:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &a, &b, &c); ^