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• 15:58, 8 May 2023 Roundgod talk contribs created page 组合数学 (Fall 2023)/Problem Set 3 (Created page with "== Problem 1 == Solve the following two existence problems: * You are given <math>n</math> integers <math>a_1,a_2,\dots,a_n</math>, such that for each <math> 1\leq i\leq n</math> it holds that <math>i-n\leq a_i\leq i-1</math>. Show that there exists a nonempty subset of these integers, whose sum is equal to <math> 0 </math>.")