(最大流)CodeForces - 499E Array and Operations You have written on a piece of paper an array ofnpositive integersa[1], a[2], ..., a[n] andmgood pairs of integers(i1, j1), (i2, j2), ..., (im, jm). Eachgood pair(ik, jk) meets the following condit...
Codeforces 498C Array and Operations(最大流) 题目是给一些数和<数对>的下标,然后进行操作:对某个<数对>中的两个数同时除以一个都能被它们整除且不等于1的数,要求的就是最多能进行多少次操作。 除数一定是素数,就是要决定某素数要除哪些<数对>使除的次数最多,ik + jkis an odd number 可以想到这个...
所以我们对于每一个质因数建图,原图中的边的两个点都存在这个这个质因数的连边,边权为两个点这个质因数的数量中较小的那一个,奇数点与源建边,边权为它存在这个质因数的个数,偶数点同理,与汇建边,然后跑最大流。 因为通过筛素数,我们也就能筛出105以内的素数,对于大于这个边界的我们可以考虑,一个数(109以...
Codeforces Round #284 (Div. 1) C. Array and Operations 二分图匹配,因为只有奇偶之间有操作,可以看出是二分图,然后拆质因子,二分图最大匹配求答案就好啦。
Minimum operations required to remove an array Given an array of N integers where N is even. There are two kinds of operations allowed on the array. Increase the value of any element A[i] by 1. If two adjacent elements in the array are consecutive prime number, delete both the element....
Hi! I need some ideas for the following problem. Given an initial array of zeros and target array, and operation of adding 1 to range [l, r]. Find the minimum number of steps to reach the target array. I am looking for a solution which is better than O(n^2). ...
Ifk=3k=3, it's impossible to make allaiaiequal to00. After performing the first operation, we'll get three elements equal to00and one equal to44. After that, all elimination operations won't change anything, since at least one chosen element will always be equal to...
在Codeforces 299 A. Ksusha and Array中,Ksusha需要解决什么问题? 题目链接 题目就是让你找出一个数组中可以将这个数组中所有数整除的数,很明显,如果存在,这个数肯定是最小的一个。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 //cf 299A //2013-06-05-20.51 #include <stdio.h> #include <string...
1556A-AVarietyOfOperations.cpp 1557A-EzzatAndTwoSubsequences.cpp 1557B-MoamenAndKSubarrays.cpp 1559A-MochaAndMath.cpp 1559B-MochaAndRedAndBlue.cpp 1559C-MochaAndHiking.cpp 1560A-DislikeOfThrees.cpp 1560B-WhosOpposite.cpp 1560C-InfinityTable.cpp 1560D-MakeAPowerOfTwo.cpp 1561A-SimplyStrangeSort...
URL:http://codeforces.com/contest/722/problem/C 代码: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #include<bits/stdc++.h> #define ll long long #define N 100005 using namespace std; int n; ll s[N]; set< pair<int,int> > seg; multiset<ll> sum; void erase(int p){ set< ...