DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, into the hash table. For the i-th number xi, DZY will put it into the bucket numbered h(xi), where h(x) is the hash function. In…

A - DZY Loves Hash DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert nnumbers, in the order they are given, into the hash table. For the i-th number xi, DZY will put it into the bucket numbered h(xi), where h(x) is the…

A. DZY Loves Hash time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, i…

A. DZY Loves Hash time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, i…

DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, into the hash table. For the i-th number xi, DZY will put it into the bucket numbered h(xi), where h(x) is the hash function. In…

DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, into the hash table. For the i-th number xi, DZY will put it into the bucket numbered h(xi), where h(x) is the hash function. In…

大意:有$n$个格子, 初始$i$位置的颜色为$i$, 美丽值为0, 有两种操作 将区间$[l,r]$内的元素全部改为$x$, 每个元素的美丽值增加$|x-y|$, $y$为未改动时的值 询问区间$[l,r]$所有元素的美丽值之和 现在给定$m$个操作, 让你输出所有操作2的询问结果. 直接线段树暴力修改, 操作2复杂度显然$O(logn)$, 考虑操作1复杂度的证明. 操作1可以看成先区间增加贡献, 之后再区间赋值, 会产生额外复杂度的只有杂色区间, 考虑杂色区间的势能. 将初值看做n次赋值操…

题目链接: http://codeforces.com/problemset/problem/445/A 题解: 这道题是在现场赛的最后一分钟通过的,相当惊险,而且做的过程也很曲折. 先是用递推,结果发现递推下去可能会出现非法的情况(一开始还不知道,坚定不移地认为这种方法是对的.Now,what can I say?) 然后用回溯,就是类似在递推的方式下,如果遇到非法就退回上一步,有了改错的机会.结果,超时.也是,这种方法太暴力了. 最后想到:一个格子的与之相邻的格子(如果能涂色),其颜色必定不…

A. DZY Loves Hash time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a hash table with p buckets, numbered from 0 to p - 1. He wants to insert n numbers, in the order they are given, i…

D. DZY Loves Strings 题目连接: http://codeforces.com/contest/444/problem/D Description DZY loves strings, and he enjoys collecting them. In China, many people like to use strings containing their names' initials, for example: xyz, jcvb, dzy, dyh. Once DZ…

DZY Loves Chemistry Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 445B Description DZY loves chemistry, and he enjoys mixing chemicals. DZY has n chemicals, and m pairs of them will re…

题目链接: http://codeforces.com/problemset/problem/444/C J. DZY Loves Colors time limit per test:2 secondsmemory limit per test:256 megabytes 问题描述 DZY loves colors, and he enjoys painting. On a colorful day, DZY gets a colorful ribbon, which consists of…

题目大意:Codeforces 444C DZY Loves Colors 题目大意:两种操作,1是改动区间上l到r上面德值为x,2是询问l到r区间总的改动值. 解题思路:线段树模板题. #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> using namespace std; const int maxn = 5*1e5; typedef long lo…

题目地址:http://codeforces.com/contest/447/problem/C C. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence…

D - DZY Loves Strings 思路:感觉这种把询问按大小分成两类解决的问题都很不好想.. https://codeforces.com/blog/entry/12959 题解说得很清楚啦. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define PLL pair<LL, LL> #define PLI pai…

B. DZY Loves Modification 题目连接: http://www.codeforces.com/contest/446/problem/B Description As we know, DZY loves playing games. One day DZY decided to play with a n × m matrix. To be more precise, he decided to modify the matrix with exactly k opera…

A. DZY Loves Sequences 题目连接: http://www.codeforces.com/contest/446/problem/A Description DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment of the sequence a. The value (j - i + 1) d…

C. DZY Loves Colors 题目连接: http://codeforces.com/contest/444/problem/C Description DZY loves colors, and he enjoys painting. On a colorful day, DZY gets a colorful ribbon, which consists of n units (they are numbered from 1 to n from left to right). T…

B. DZY Loves FFT 题目连接: http://codeforces.com/contest/444/problem/B Description DZY loves Fast Fourier Transformation, and he enjoys using it. Fast Fourier Transformation is an algorithm used to calculate convolution. Specifically, if a, b and c are s…

A. DZY Loves Physics 题目连接: http://codeforces.com/contest/444/problem/A Description DZY loves Physics, and he enjoys calculating density. Almost everything has density, even a graph. We define the density of a non-directed graph (nodes and edges of th…

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题目传送门 /* DP:先用l,r数组记录前缀后缀上升长度,最大值会在三种情况中产生: 1. a[i-1] + 1 < a[i+1],可以改a[i],那么值为l[i-1] + r[i+1] + 1 2. l[i-1] + 1 3. r[i+1] + 1 //修改a[i] */ #include <cstdio> #include <algorithm> #include <cstring> using namespace std; ; const int INF…

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DZY Loves Colors Time Limit: 2000ms Memory Limit: 262144KB This problem will be judged on CodeForces. Original ID: 445E64-bit integer IO format: %I64d      Java class name: (Any) DZY loves colors, and he enjoys painting. On a colorful day, DZY gets a…

题目链接:Codeforces 444A DZY Loves Physics 题目大意:给出一张图,图中的每一个节点,每条边都有一个权值.如今有从中挑出一张子图,要求子图联通,而且被选中的随意两点.假设存在边,则一定要被选中.问说点的权值和/边的权值和最大是多少. 解题思路:是图论中的一个结论,最多两个节点.所以枚举两条边就能够了.我简单的推了一下,2个点的情况肯定比3个点的优. 如果有3个点a,b,c,权值分别为A,B.C 现a-b,b-c边的权值分别为u.v 那么对于两点的情况有A+Bu,B…

In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation F1 = 1; F2 = 1; Fn = Fn - 1 + Fn - 2 (n > 2). DZY loves Fibonacci numbers very much. Today DZY gives you an array consisting of n integers: a1, a2, ...,…

C. DZY Loves Fibonacci Numbers time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output In mathematical terms, the sequence Fn of Fibonacci numbers is defined by the recurrence relation F1 = 1; F2 …

C. DZY Loves Sequences time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY has a sequence a, consisting of n integers. We'll call a sequence ai, ai + 1, ..., aj (1 ≤ i ≤ j ≤ n) a subsegment…

參考:http://www.cnblogs.com/chanme/p/3843859.html 然后我看到在别人的AC的方法里还有这么一种神方法,他预先设定了一个阈值K,当当前的更新操作数j<K的时候,它就用一个类似于树状数组段更的方法,用一个 d数组去存内容,譬如它要在区间 [3,6]上加一段fibonacci 原来: id 0 1 2 3 4 5 6 7 8 9 10 d  0 0 0 0 0 0 0 0 0 0 0 更新: id 0 1 2 3 4 5 6  7  8  9 10 d  0…

A. DZY Loves Chessboard time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output DZY loves chessboard, and he enjoys playing with it. He has a chessboard of n rows and m columns. Some cells of the c…