/in/foo.cc: In function 'int main()':
/in/foo.cc:12:28: warning: unused variable 'ci' [-Wunused-variable]
   12 |     int n,i,left,right,mid,ci,m,last=1,haha=0,ans;
      |                            ^~
/in/foo.cc:12:33: warning: unused variable 'last' [-Wunused-variable]
   12 |     int n,i,left,right,mid,ci,m,last=1,haha=0,ans;
      |                                 ^~~~
/in/foo.cc:77:10: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
   77 |    cout<<ans;
      |          ^~~
/in/foo.cc:12:47: note: 'ans' was declared here
   12 |     int n,i,left,right,mid,ci,m,last=1,haha=0,ans;
      |                                               ^~~