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…

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…

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…

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/problemset/problem/752/C time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Santa Claus has Robot which lives on the infinite grid and can move along its lines. He…

题面: 传送门 B. Santa Claus and Keyboard Check Input file: standard input Output file: standard output Time limit: 2 second Memory limit: 256 megabytes   Santa Claus decided to disassemble his keyboard to clean it. After he returned all the keys back, he su…

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…