◇赛时·V◇ Codeforces Round #486 Div3 又是一场历史悠久的比赛,老师拉着我回来考古了……为了不抢了后面一些同学的排名,我没有做A题 ◆ 题目&解析 [B题]Substrings Sort +传送门+   [暴力模拟] 题意 给出n个字符串,你需要将它们排序,使得对于每一个字符串,它前面的字符串都是它的子串(对于字符串i,则字符串 1~i-1 都是它的子串). 解析 由于n最大才100,所以 O(n3) 的算法都不会爆,很容易想到暴力模拟. 如果字符串i是字符串j的子串…

Codeforces Round #486 (Div. 3) D. Points and Powers of Two 题目连接: http://codeforces.com/group/T0ITBvoeEx/contest/988/problem/D Description There are n distinct points on a coordinate line, the coordinate of i-th point equals to xi. Choose a subset of…

Codeforces Round #486 (Div. 3) F. Rain and Umbrellas 题目连接: http://codeforces.com/group/T0ITBvoeEx/contest/988/problem/E Description Polycarp lives on a coordinate line at the point x=0. He goes to his friend that lives at the point x=a. Polycarp can…

Codeforces Round #486 (Div. 3) E. Divisibility by 25 题目连接: http://codeforces.com/group/T0ITBvoeEx/contest/988/problem/E Description You are given an integer n from 1 to 10^18 without leading zeroes. In one move you can swap any two adjacent digits in…

Codeforces Round #486 (Div. 3) A. Diverse Team 题目连接: http://codeforces.com/contest/988/problem/A Description There are n students in a school class, the rating of the i-th student on Codehorses is ai. You have to form a team consisting of k students…

http://codeforces.com/contest/1092/problem/C Ivan wants to play a game with you. He picked some string ss of length nn consisting only of lowercase Latin letters. You don't know this string. Ivan has informed you about all its improper prefixes and s…

http://codeforces.com/contest/1092/problem/B There are nn students in a university. The number of students is even. The ii-th student has programming skill equal to aiai. The coach wants to form n2n2 teams. Each team should consist of exactly two stu…

这次div3比上次多一道, 也加了半小时, 说区分不出1600以上的水平.(我也不清楚). A. Remove Duplicates 题意:给你一个数组,删除这个数组中相同的元素, 并且保留右边的元素. 代码: #include<bits/stdc++.h> using namespace std; #define Fopen freopen("_in.txt","r",stdin); freopen("_out.txt","…

这次比赛从名字就可以看出非常水,然鹅因为第一次打codeforces不太熟悉操作只来的及做签到题(还错了一次) A,B,C都是签到题考点思维就不写了 D题 https://codeforces.ml/problemset/problem/1311/D 题目大意是:有t组数据每组数据给你三个数,a,b,c每次一个数加一或 者减一都算一次操作(不能为变负数),问最小的操作次数构造出A, B,C使b%a==0,c%b==0. t<1000,a,b,c<1e4 时限2s 首先想到是找b的倍数与a,c最…

B. Substrings Sort time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given nn strings. Each string consists of lowercase English letters. Rearrange (reorder) the given strings in such…