Compilare: user.cpp: In function ‘bool bellman_ford()’: user.cpp:28:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[s].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:87:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < r.size(); i++) ^ user.cpp:43:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmcm.in", "r", stdin); ^ user.cpp:44:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmcm.out", "w", stdout); ^ user.cpp:47:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i", &n, &m, &e); ^ user.cpp:51:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i", &x, &y, &c); ^