Why stable_sort() worked, but sort() didn't?
I used sort() in https://mirror.codeforces.com/contest/2056/submission/325199850 and got runtime error verdict, but used stable_sort() in https://mirror.codeforces.com/contest/2056/submission/325199048 and got accepted verdict.
Can someone please explain the reason? The rest of the code is unchanged.
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