I submitted the solution for codeforces round 707 Division 2 Problem C and got a TLE in Test case 6 in main tests. However, when I submit the same code now, it gets accepted. This is very peculiar to me and it also cost me dearly in this contest. Can somebody explain to me how this came to happen?

I also read other people's blogs in the past about the same thing and wonder what was done in their case.

My submission During contest 109885106

My submission right after contest 109893670