Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:30:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<g[x].size(); i++) ^ user.cpp: In function ‘int bf()’: user.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<g[nod].size(); j++) ^ user.cpp: In function ‘int works()’: user.cpp:69:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<g[i].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:133:32: 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:134:34: 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:135:34: 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:139:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &z); ^