Hi Everyone, i have been seeing this for some days now on codeforces. In yesterday's educational round, I submitted problem D with https://codeforces.com/contest/1107/submission/49013323 solution. Later I realized that it takes minimum 5040*5040*60 operations in worst case. After contest, i tried hacking my solution but it passed successfully. Also I think testcase 20 is having same worst case input (all 0's and last rows last element if say 1), but it passes there in 732 ms. In my local env it takes more than 4s for this to pass.
Also in CF#534, I tried hacking this O(n^2) solution https://codeforces.com/contest/1104/submission/48743647, which was doing more than 10^9 operation on worst case (ababa....aa..bababababa string). But it passed in 640 ms. From my understanding it takes 1s for approx 10^8 operations.
Has codeforces upgraded there testing servers or I am missing something here?