C. Destroying Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the ar…

原题链接:https://vjudge.net/problem/511814/origin Description: You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the array one by one. Thus, you are given the permutation of integers from 1…

题意:给定 n 个数,然后每次破坏一个位置的数,那么剩下的连通块的和最大是多少. 析:用并查集来做,从后往前推,一开始什么也没有,如果破坏一个,那么我们就加上一个,然后判断它左右两侧是不是存在,如果存在,那么就合并起来, 然后不断最大值,因为这个最大值肯定是不递减,所以我们一直更新就好. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <s…

Destroying Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the array…

C. Destroying Array 题目连接: http://codeforces.com/contest/722/problem/C Description You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the array one by one. Thus, you are given the permuta…

原题中需要求解的是按照它给定的操作次序,即每次删掉一个数字求删掉后每个区间段的和的最大值是多少. 正面求解需要维护新形成的区间段,以及每段和,需要一些数据结构比如 map 和 set. map<int, LL>interval2Sum来维护区间段(u->v),mulitset<LL>sum 来维护最大值.那么每次删除操作后,都需要去interval2Sum中找到对应区间,然后erase掉, 重新生成left -> delId -> right两个区间段,最后在ma…

链接:Destroying Array C. Destroying Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destro…

题目链接:Codeforces 482B Interesting Array 题目大意:给定一个长度为N的数组,如今有M个限制,每一个限制有l,r,q,表示从a[l]~a[r]取且后的数一定为q,问是 否有满足的数列. 解题思路:线段树维护.每条限制等于是对l~r之间的数或上q(取且的性质,对应二进制位一定为1).那么处理全然部的 限制.在进行查询.查询相应每一个l~r之间的数取且是否还等于q.所以用线段树维护取且和.改动为或操作. #include <cstdio> #include <…

Codeforces 1077C Good Array https://vjudge.net/problem/CodeForces-1077C 题目: Let's call an array good if there is an element in the array that equals to the sum of all other elements. For example, the array a=[1,3,3,7]a=[1,3,3,7] is good because there…

题目:codeforces 482B. Interesting Array 题意:给你一个值n和m中操作,每种操作就是三个数 l ,r,val. 就是区间l---r上的与的值为val,最后问你原来的数组是多少?假设不存在输出no 分析:分析发现要满足全部的区间,而一个点上假如有多个区间的话,这个点的值就是全部区间或的值.由于仅仅有这样才干满足全部区间的.把全部位上的1都保存下来了.那么能够发现用线段树来维护,可是那么怎么推断满不满足条件呢?能够也用线段树,更新了之后在整个维护一遍看看满不满足题意…

codeforces 407C Curious Array UPD: 我觉得这个做法比较好理解啊 参考题解:https://www.cnblogs.com/ChopsticksAN/p/4908377.html 1.杨辉三角可以由多维前缀和求得. 2."搭顺风车"的思想. 3.// 右端点减去的那个数可以用组合数学的方法思考. #include<bits/stdc++.h> using namespace std; #define fi first #define se s…

题目链接:codeforces 797 E. Array Queries   题意:给你一个长度为n的数组a,和q个询问,每次询问为(p,k),相应的把p转换为p+a[p]+k,直到p > n为止,求每次询问要转换的次数. 题解:纯暴力会TLE,所以在k为根号100000范围内dp打表 dp[i][j]表示初始p为i, k为j,需要转换几次可以大于n. 状态转移方程:dp[i][j] = dp[i+a[i]+j] + 1 #include <cstdio> #include <al…

C. Destroying Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the ar…

[codeforces722C]Destroying Array 试题描述 You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the array one by one. Thus, you are given the permutation of integers from 1 to n defining the or…

C. Destroying Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array consisting of n non-negative integers a1, a2, ..., an. You are going to destroy integers in the ar…

题意 输入一个含有 n(1≤n≤100000) 个非负整数的 a 数组和一个 1-n 的排列 p 数组,求每次删除 a[p[i]] 后,最大连续子段和(不能跨越被删除的)是多少? 分析 因为都是非负整数,答案一定是尽量长的区间和. s[i] 表示 a 的前缀和,区间(l,r]的和就是s[r]-s[l]. 我们用 STL 里的 set 存区间,一开始只有(0,n]区间,删去第一个数后,就要去掉(0,n]区间,加上(0,p[1]-1]和(p[1],n]区间,类似地每次删除一个数,就要去掉包含它的区间…

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output You are given an array consisting of n non-negative integers a1, a2, -, an. You are going to destroy integers in the array one by one. Thus, you…

题目大意就是给长度为 n 一个数列,有 n 每次删除,每一次删除第 i 个位置上的数,求每一次删除后剩余不连续数列的最大区间和. 输入样例 4 1 3 2 5 3 4 1 2 输出样例 5 4 3 0 第二行是原来的数列,第三行是删除第 i 个数. 这道题的正解是用并查集来做.要将删除的顺序存下来,并倒序操作,这样就相当于每一次加上第 i 数.然后判断加上的数的左右两边是否有数,有就合并,并尝试用合并的新的区间和更新答案.对了,答案也要存下来,再倒序输出,才是真正的答案. #include<cs…

Description An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarray al, al + 1..., ar, where 1 ≤ l ≤ r ≤ n. For every positive integer s denote by Ks the number of occurrences of s into the subarray. We call the…

A. Co-prime Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array of n elements, you must make it a co-prime array in as few moves as possible. In each move you can i…

Wilbur and Array Time Limit: 2000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description Wilbur the pig is tinkering with arrays again. He has the array a1, a2, ..., an initially consisting of n zeros. At one step, he c…

题目链接:http://codeforces.com/contest/722/problem/C 题意:每次破坏一个数,求每次操作后的最大连续子串和. 思路:并查集逆向操作 #include<bits/stdc++.h> using namespace std; typedef long long ll; const int N = 1e5 + 10; ll sum[N], ans[N]; int n, a[N], b[N], father[N], r[N]; bool vis[N]; int…

题 You are given array ai of length n. You may consecutively apply two operations to this array: remove some subsegment (continuous subsequence) of length m < n and pay for it m·a coins; change some elements of the array by at most 1, and pay b coins…

题目链接:http://codeforces.com/problemset/problem/371/A 题目意思:给出n和k和一个只有1或者2组成的序列,需要求出最少的改变次数,使得 n/k 组里面的数完全相等.如果该序列n/k组里面的数本来已经全部相等,输出0. 我的做法是,在这个序列中,找出n/k对应位置的数,统计1和0的个数.以第一组数据样例来说(n/k = 3组数,每组数用 "|" 隔开), 序号i :             1 2 | 3 4 | 5 6 对应的序列:   …

D. Powerful array time limit per test 5 seconds memory limit per test 256 megabytes input standard input output standard output An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarray al, al + 1..., ar, where 1 …

Description Wilbur the pig is tinkering with arrays again. He has the array a1, a2, ..., an initially consisting of n zeros. At one step, he can choose any index i and either add 1 to all elements ai, ai + 1, ... , an or subtract 1 from all elements …

http://codeforces.com/contest/494/problem/D 题意:给一个数组,和一个坏质数集合,可以无数次地让1到i这些所有数字除以他们的gcd,然后要求Σf(a[i])的最大值,其中 f(x)=f(x/p)+1,p为x的最小质数,且p不为坏质数 f(x/p)-1 ,p为x的最小质数,且p为坏质数 思路:我们考虑,如果f[j]取了1到j的gcd,那么对后面的决策并没有任何影响,因为我们统计的贡献,只统计1到i这个部分,不统计i以后的部分. 略坑,不知道第一次被什么卡了…

A. Unimodal Array time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Array of integers is unimodal, if: it is strictly increasing in the beginning; after that it is constant; after that it is…

Description An array of positive integers a1, a2, ..., an is given. Let us consider its arbitrary subarray al, al + 1..., ar, where 1 ≤ l ≤ r ≤ n. For every positive integer s denote by Ks the number of occurrences of s into the subarray. We call the…

D. Array Restoration time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Initially there was an array $$$a$$$ consisting of $$$n$$$ integers. Positions in it are numbered from $$$1$$$ to $$$n$$…