/in/foo.cc: In function 'int main()':
/in/foo.cc:5:22: warning: unused variable 'maxn' [-Wunused-variable]
  int n,ge,shi,bai,nt,maxn=-100000,minn=100000,a[3],maxnt,it;
                      ^~~~
/in/foo.cc:5:52: warning: unused variable 'maxnt' [-Wunused-variable]
  int n,ge,shi,bai,nt,maxn=-100000,minn=100000,a[3],maxnt,it;
                                                    ^~~~~
/in/foo.cc:61:8: warning: 'it' may be used uninitialized in this function [-Wmaybe-uninitialized]
   a[it]=100000;
   ~~~~~^~~~~~~