Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:145:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[nod].size(); j++) ^ user.cpp: In function ‘void citire()’: user.cpp:29:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&M); ^ user.cpp:40:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&a,&b,&cost); ^ user.cpp: In function ‘void dijkstra(int)’: user.cpp:166:39: 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: In function ‘int main()’: user.cpp:178:37: 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); ^