排序,构造. 相当于告诉我们一棵树$n$个节点,每个节点在哪一层,至少需要移动多少个节点,才能让这些节点变成一棵树. 按照层次排个序移动一下就可以了,优先选择那些不是$s$但是层次是$0$的节点,如果没有,那么再选择层次最高的. #pragma comment(linker, "/STACK:1024000000,1024000000") #include<cstdio> #include<cstring> #include<cmath> #incl…

[题目链接]:http://codeforces.com/problemset/problem/738/E [题意] 给你一个类似树形的关系; 然后告诉你某个人头顶上有多少个上司numi; 只有father的father才算是它的上司,father的兄弟不算; 然后告诉你所有的人里面最大boss的标号; 问你最少有多少个numi是错误的; [题解] 会发现; 这里的numi实际上和这个人在树中的深度对应; 则我们把最后的numi数组升序排一下; 如果相邻两个数字它们的差的绝对值不超过1; 且第一…

题目链接:http://codeforces.com/problemset/problem/729/E 既然每一个人都有一个顶头上司,考虑一个问题: 如果这些人中具有上司数目最多的人有$x$个上司,那么一定存在一些人,他们分别有$x-1,x-2...1$个上司. 首先如果$s$位置上的上司数目不为$0$,非$s$位置上的上司数目为$0$它们就是一定说错了话的. 问题转化为了:将合法的上司数目从小到大小排序,我们现在要这个序列的数字连续单调不降,并且相差不能为大于$1$. 有一人些已经说错了话,考…

从前往后扫,找到一出现次数为0的数,从后面找一个出现不为0的数转化而来.设置两指针l, r来处理. #include<cstdio> #include<iostream> #include<cstdlib> #include<cstring> #include<string> #include<algorithm> #include<map> #include<queue> #include<vector…

E. Subordinates time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n workers in a company, each of them has a unique id from 1 to n. Exaclty one of them is a chief, his id is s. Each…

E. Subordinates time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There are n workers in a company, each of them has a unique id from 1 to n. Exaclty one of them is a chief, his id is s. Each…

题目链接 http://codeforces.com/contest/729/problem/E 题意:给你n个人,主管id为s,然后给你n个id,每个id上对应一个数字表示比这个人大的有几个. 最后问你有几个人搞错了. 一道简单的贪心题先将比自己大有i个人的存起来然后倒着贪心讲后面的补上前面不足的.当主管搞错时要特殊考虑一下 拿样例举例 (1) 3 2 2 0 2 (上司数) 0 1 (个数)     1 0 2 2 这样显然不符合因为上司为1个的没有而上司为2个的却有2个,所以一定要吧补上一…

大意: 求构造一棵树, 每个节点回答它的祖先个数, 求最少打错次数. 挺简单的一个构造, 祖先个数等价于节点深度, 所以只需要确定一个最大深度然后贪心即可. 需要特判一下根的深度, 再特判一下只有一个结点的情况 #include <iostream> #include <algorithm> #include <cstdio> #include <math.h> #include <set> #include <map> #inclu…

There are n workers in a company, each of them has a unique id from 1 to n. Exaclty one of them is a chief, his id is s. Each worker except the chief has exactly one immediate superior. There was a request to each of the workers to tell how how many…

B. President's Office 题目连接: http://codeforces.com/contest/6/problem/B Description President of Berland has a very vast office-room, where, apart from him, work his subordinates. Each subordinate, as well as President himself, has his own desk of a un…