Compilare: user.cpp: In function ‘void dj(int)’: user.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[k].size();j++) ^ user.cpp:28:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<g[k].size();j++) ^ user.cpp: In function ‘int main()’: user.cpp:35:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in.in","r",stdin); ^ user.cpp:36:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dijkstra.in.out","w",stdout); ^ user.cpp:37:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:40:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^