E. Santa Claus and Tangerines time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus has n tangerines, and the i-th of them consists of exactly ai slices. Santa Claus came to a school…

E. Santa Claus and Tangerines time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus has n tangerines, and the i-th of them consists of exactly ai slices. Santa Claus came to a school…

Santa Claus and Tangerines 题目链接:http://codeforces.com/contest/752/problem/E 二分 显然直接求答案并不是很容易,于是我们将其转化为判定性问题:二分解x,验证是否能分成k个x. 于是要点就在于check函数: 由于奇偶的原因,每个ai分出来的并不是2的幂次(比如当ai=11,x=3时,可以将ai分成3部分5,3,3). 但是稍作思考,可以发现还是与2的幂次有关: 例如,当ai=6:48,x=3时, ai part1 part…

E. Santa Claus and Tangerines time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus has n tangerines, and the i-th of them consists of exactly ai slices. Santa Claus came to a school…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus has n tangerines, and the i-th of them consists of exactly ai slices. Santa Claus came to a school which has k pupils. Santa dec…

题目链接:http://codeforces.com/contest/752/problem/E 题意:给n个橘子,每个橘子a(i)片,要分给k个人,问每个人最多分多少片.每个橘子每次对半分,偶数的话对半,奇数的话有一半会多一片. 二分答案,拿答案去判断.判断时记录dp(i)为橘子为i片的时候,最多分给多少人.枚举的时候从二分到的答案开始,由当前i的一半相加即可. #include <bits/stdc++.h> using namespace std; ; typedef long long…

http://codeforces.com/contest/752/problem/E 首先有一个东西就是,如果我要检测5,那么14我们认为它能产生2个5. 14 = 7 + 7.但是按照平均分的话,它是不能产生5的,那就把那两个7当成是两个5,因为7比5还大,对min(b[i])是没有影响的. 可以思考下样例2. 那么二分答案mid,设dp[val][x]表示val这个数字能产生多少个x.dp[val][x] = dp[val / 2][x] + dp[(val + 1) / 2][x] 那么…

题意:将n个蛋糕分给k个人,要保证每个人都有蛋糕或蛋糕块,蛋糕可切, 1.若蛋糕值为偶数,那一次可切成对等的两块. 2.若蛋糕值为奇数,则切成的两块蛋糕其中一个比另一个蛋糕值多1. 3.若蛋糕值为1,则不可切. 问每个人拥有的蛋糕中最小蛋糕值可能的最大值是多少. 分析: 1.若每个蛋糕都分成蛋糕值为1,即n个蛋糕的蛋糕值总和<k,则输出-1. 2.验证mid是否成立,若某蛋糕值x大于mid,则可切,并将该蛋糕可切成的块数保存在vis[x]中. 3.若mid为5,而x为11,则有必要切蛋糕x,若x…

D. Santa Claus and a Palindrome time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus likes palindromes very much. There was his birthday recently. k of his friends came to him to co…

time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus likes palindromes very much. There was his birthday recently. k of his friends came to him to congratulate him, and each of them…