There is a strange thing between C++14 and C++20
We can see that the down two code are same, but the code using C++20 got TLE, and the code using C++14 got AC
https://mirror.codeforces.com/contest/1634/submission/145631828
https://mirror.codeforces.com/contest/1634/submission/145633066
We can also see that the down two code are same, but the code using C++14 got TLE, and the code using C++20 got AC
https://mirror.codeforces.com/problemset/submission/573/145373496
https://mirror.codeforces.com/problemset/submission/573/145372752
What's wrong with it? It there anyone could help me answer the question? Many Thanks!