Compilare: user.cpp: In function ‘int main()’: user.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < adj[j].size(); k++) { ^ user.cpp:36:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < adj[i].size(); j++) { ^ user.cpp:15:40: 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:16:42: 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); ^