So it fails on pretest 7 and I don't know why my idea isn't good, the editorial has other solution. (submission : https://codeforces.me/contest/1691/submission/159075882)
So it fails on pretest 7 and I don't know why my idea isn't good, the editorial has other solution. (submission : https://codeforces.me/contest/1691/submission/159075882)
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