【摘要】 鸽巢原理是组合学中一个非常重要的原理。介绍其实际应用,并对某些应用进行总结,同时分析如何根据问题来构造抽屉。更多还原

【Abstract】 The pigeonhole principle is a important principle in combinatorics.This article introduces its applications and sums up some of them and analyses how to instruct drawer according to the question.更多还原