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Discussion of Problem
2156
. Interesting Conversations
andreyDagger
WA3
// Problem
2156. Interesting Conversations
26 Jan 2022 16:39
3
1 1 1
Every subset must contain at least one element
Edited by author 26.01.2022 16:39
Toshpulatov (MSU Tashkent)
hint
// Problem
2156. Interesting Conversations
1 Apr 2021 14:11
(a1 - a2) + (a2 - a3) + .... + (an - a1) == b1 + b2 + .... + bn == 0
-> we have some elements b < 0 and b >= 0
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