4756: [Usaco2017 Jan]Promotion Counting Time Limit: 10 Sec Memory Limit: 128 MBSubmit: 305 Solved: 217[Submit][Status][Discuss] Description The cows have once again tried to form a startup company, failing to remember from past experience t hat cow…
原文地址:http://www.cnblogs.com/GXZlegend/p/6832263.html 题目描述 The cows have once again tried to form a startup company, failing to remember from past experience that cows make terrible managers!The cows, conveniently numbered 1…N1…N (1≤N≤100,000), organi…
Why Did the Cow Cross the Road III bzoj-4994 Usaco-2017 Feb 题目大意:给定一个长度为$2n$的序列,$1$~$n$个出现过两次,$i$第一次出现的位置记为$a_i$,第二次记为$b_i$,求满足$a_i<a_j<b_i<b_j$的个数. 注释:$1\le n\le 10^5$. 想法: 这个题有一个非常不一样的地方. 我记得我之前做过的长成这样的题大概都是第一个位置+1,第二个位置-1即可. 这个题我们只能对第一个位置进行操作.…