/in/foo.cc: In function 'int main()':
/in/foo.cc:17:36: warning: iteration 5005 invokes undefined behavior [-Waggressive-loop-optimizations]
  for (int i=0;i<=MAXN;i++) dp[i][0]=0;
                            ~~~~~~~~^~
/in/foo.cc:17:16: note: within this loop
  for (int i=0;i<=MAXN;i++) dp[i][0]=0;
               ~^~~~~~