Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:17:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecini[x0].size(); i++){ ^ user.cpp:37:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vecini[nod].size(); i++){ ^ user.cpp: In function ‘int main()’: user.cpp:53:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in","r",stdin); ^ user.cpp:54:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.out","w",stdout); ^ user.cpp:55:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^