/in/foo.cc: In function 'int main()':
/in/foo.cc:32:22: warning: iteration 100010 invokes undefined behavior [-Waggressive-loop-optimizations]
         ans+=lct[j][i]*rct[j][i];
              ~~~~~~~~^
/in/foo.cc:30:18: note: within this loop
     for(int i=0;i<=100010;i++) 
                 ~^~~~~~~~