Compilare: user.cpp: In function ‘void dijkstra(int)’: user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=q.size();i++) ^ user.cpp:43:7: warning: unused variable ‘ok’ [-Wunused-variable] int ok=0; ^ user.cpp: In function ‘void exec(const char*, const char*)’: user.cpp:69:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file_in,"%d%d",&N,&M); ^ user.cpp:74:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file_in,"%d%d%d",&node,&value,&length); ^