HDU 6070 Partition Problem : 给一段长度为n的序列,要求找出一段区间,使得这段区间的数字种类除以区间长度最小.输出最后的答案即可.(n <= 60000)(9s时限) Solution : 显然,答案是0~1中的一个数字,可以很自然的想到二分答案的做法.假设目前二分到的答案为mid,那么需要判断 \[\frac{cnt(l, r)}{r- l + 1} <= mid\] 其中cnt(l,r)为l到r这个区间内的数字种类.变化一下式子可以得到: \[cnt(l, r)…

题意:求AC率,x/y 的最小值,x是区间数字的种类数,y是区间的长度. 分析: 二分答案比率.ans, 动态插入结点,一些区间的size会发生变化,是那些前面暂时没有新的结点的区间 size + 1. ans*l,每一个区间只有一个ans*l,只与 l 相关,线段树单点更新. 用线段树维护区间的最小值.最小值小于 ans,二分左移. #include <bits/stdc++.h> using namespace std; ; ; int a[maxn]; int last[maxn]; ]…

Weak Pair Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)Total Submission(s): 439    Accepted Submission(s): 155 Problem Description You are given a rooted tree of N nodes, labeled from 1 to N. To the ith node a…

Assign the task Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1647    Accepted Submission(s): 753 Problem Description There is a company that has N employees(numbered from 1 to N),every emplo…

Queue-jumpers Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3348    Accepted Submission(s): 904 Problem Description Ponyo and Garfield are waiting outside the box-office for their favorite mo…

Sequence operation Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 7502    Accepted Submission(s): 2233 Problem Description lxhgww got a sequence contains n characters which are all '0's or '1…

Transformation Time Limit: 15000/8000 MS (Java/Others)    Memory Limit: 65535/65536 K (Java/Others) Total Submission(s): 4095    Accepted Submission(s): 1008 Problem Description Yuanfang is puzzled with the question below:  There are n integers, a1,…

威威猫系列故事——晒被子 Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 1592    Accepted Submission(s): 444 Problem Description 因为马拉松初赛中吃鸡腿的题目让不少人抱憾而归,威威猫一直觉得愧对大家,这几天他悄悄搬到直角坐标系里去住了. 生活还要继续,太阳也照常升起,今天,威威猫在…

Memory Control Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 5913    Accepted Submission(s): 1380 Problem Description Memory units are numbered from 1 up to N. A sequence of memory units is c…

Adding New Machine Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1428    Accepted Submission(s): 298 Problem Description Incredible Crazily Progressing Company (ICPC) suffered a lot with the…