Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:57:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[jmin].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:77:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.in","r",stdin); ^ user.cpp:78:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lanterna.out","w",stdout); ^ user.cpp: In function ‘void dijkstra()’: user.cpp:55:12: warning: ‘jmin’ may be used uninitialized in this function [-Wmaybe-uninitialized] f[jmin]=1; ^