You have written on a piece of paper an array of n positive integers a[1], a[2], ..., a[n] and m good pairs of integers (i1, j1), (i2, j2), ..., (im, jm). Each good pair (ik, jk) meets the following conditions: ik + jk is an odd number and 1 ≤ ik < j…
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 + jk is an odd number 可以想到这个是个二分图,数最多100个,然后就用最大流做了. 有了POJ2516的经验之后,马上想到,素数是独立的,进行若干次最大流而不是拆若干点跑最大流(109大概最多拆30个点吧).. 然后我还是没AC,因为…
题目链接: http://codeforces.com/problemset/problem/498/C C. Array and Operations time limit per test1 secondmemory limit per test256 megabytes 问题描述 You have written on a piece of paper an array of n positive integers a[1], a[2], ..., a[n] and m good pair…
C. Array and Operations time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have written on a piece of paper an array of n positive integers a[1], a[2], ..., a[n] and m good pairs of intege…
A. Array and Operations Time Limit: 1000ms Memory Limit: 262144KB 64-bit integer IO format: %I64d Java class name: (Any) Submit Status You have written on a piece of paper an array of n positive integers a[1], a[2], ..., a[n] and m good pairs of…
Power Network 时间限制: 1 Sec 内存限制: 128 MB 题目描述 A power network consists of nodes (power stations, consumers and dispatchers) connected by power transport lines. A node u may be supplied with an amount s(u) >= 0 of power, may produce an amount 0 <= p(u…
CF498C. Array and Operations 题意: 给定一个长为 n 的数组,以及 m 对下标 (a, b) 且满足 a + b 为奇数,每次操作可以将同一组的两个数同时除以一个公约数 问最多能进行多少次操作 \[1≤n,m ≤100,1≤ai ≤10^9\] 根据奇偶性二分图定理此题必定考二分图 贪心,每次除一个质数 质数之间是独立的,可以分开考虑每一个质因子 建图:s -x中质因子p数量-> x -inf-> y -y中质因子p数量-> t 最大权匹配就是这个质因子能带…
HDU 3081 Marriage Match II (网络流,最大流,二分,并查集) Description Presumably, you all have known the question of stable marriage match. A girl will choose a boy; it is similar as the game of playing house we used to play when we are kids. What a happy time as…
