/in/foo.cc: In function 'int main()':
/in/foo.cc:9:15: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
  register int ans,i,n,k,MIN,sum,time;
               ^~~
/in/foo.cc:13:55: warning: 'sum' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(i=1;i<=n;i++) cin>>len[i],MIN=min(MIN,len[i]),sum+=len[i];
                                                    ~~~^~~~~~~~