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Codeforces (c) Copyright 2010-2026 Михаил Мирзаянов
Соревнования по программированию 2.0
Время на сервере: 11.11.2026 00:58:27 (g2).
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std::map sorts key values, so while iterating them you go from less to bigger and that's what you need for this problem. However, unordered_map does not sort them and it leads to WA.
TooNewbie but why we need order to be sorted . why we need to iterate from lesser to higher . ?
You need to minimize the value of mp[1] since the possibility of traveling to that point is enough to visit all positions. While considering the values from lower to higher and if you had 1 in your map, it will appear earlier, consequently, you will find more optimal choices for mp[1].
okay , i understand . basically u r saying , for a particular mp[gcd] value , we have to check all pair , if we use un.map then some values may skip which will reduce our optimallity .
for the help.