Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:38:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[start].size(); i++){ ^ user.cpp:49:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ;i < G[top].size(); i++){ ^ user.cpp: In function ‘void read()’: user.cpp:75:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^ user.cpp: In function ‘int main()’: user.cpp:82:34: 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:83:36: 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); ^