Compilare: user.cpp: In function ‘int bf()’: user.cpp:22:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<g[nod].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:101:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trafic.in","r",stdin); ^ user.cpp:102:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trafic.out","w",stdout); ^ user.cpp:103:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &m, &gmax); ^ user.cpp:107:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &z); ^