Compilare: user.cpp: In function ‘int main()’: user.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[no].size();++j) ~^~~~~~~~~~~~~ user.cpp:16:23: warning: unused variable ‘ok’ [-Wunused-variable] int n,m,i,nod,x,y,ok=0,j,no,dr,vecin; ^~ user.cpp:19:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&n,&m,&nod); ^ user.cpp:22:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^