知识普及: Educational使用拓展ACM赛制,没有现场hack,比赛后有12h的全网hack时间. rank按通过题数排名,若通过题数相等则按罚时排名. (罚时计算方式:第一次通过每题的时间之和+错误提交次数$\times$10min) A: 送分题. #include<bits/stdc++.h> #define maxn 100005 #define maxm 500005 #define inf 0x7fffffff #define ll long long using name…

链接: https://codeforces.com/contest/1251/problem/D 题意: You are the head of a large enterprise. n people work at you, and n is odd (i. e. n is not divisible by 2). You have to distribute salaries to your employees. Initially, you have s dollars for it,…

链接: https://codeforces.com/contest/1251/problem/C 题意: You are given a huge integer a consisting of n digits (n is between 1 and 3⋅105, inclusive). It may contain leading zeros. You can swap two digits on adjacent (neighboring) positions if the swappi…

链接: https://codeforces.com/contest/1251/problem/B 题意: A palindrome is a string t which reads the same backward as forward (formally, t[i]=t[|t|+1−i] for all i∈[1,|t|]). Here |t| denotes the length of a string t. For example, the strings 010, 1001 and…

链接: https://codeforces.com/contest/1251/problem/A 题意: Recently Polycarp noticed that some of the buttons of his keyboard are malfunctioning. For simplicity, we assume that Polycarp's keyboard contains 26 buttons (one for each letter of the Latin alph…

目录 Contest Info Solutions A. Broken Keyboard B. Binary Palindromes C. Minimize The Integer D. Salary Changing E2. Voting (Hard Version) Contest Info Practice Link Solved A B C D E1 E2 F 6/7 O O O O O O - O 在比赛中通过 Ø 赛后通过 ! 尝试了但是失败了 - 没有尝试 Solutions A.…

#define HAVE_STRUCT_TIMESPEC#include<bits/stdc++.h>using namespace std;pair<int,int>a[200007];int n;long long s;bool check(int x){ int num=0; long long sum=s; for(int i=n;i;--i){ if(a[i].first>=x) ++num; else if(a[i].second>=x&&s…

[Educational Codeforces Round 16]E. Generate a String 试题描述 zscoder wants to generate an input file for some programming competition problem. His input is a string consisting of n letters 'a'. He is too lazy to write a generator so he will manually ge…

[Educational Codeforces Round 16]D. Two Arithmetic Progressions 试题描述 You are given two arithmetic progressions: a1k + b1 and a2l + b2. Find the number of integers x such that L ≤ x ≤ R andx = a1k' + b1 = a2l' + b2, for some integers k', l' ≥ 0. 输入 Th…

[Educational Codeforces Round 16]C. Magic Odd Square 试题描述 Find an n × n matrix with different numbers from 1 to n2, so the sum in each row, column and both main diagonals are odd. 输入 The only line contains odd integer n (1 ≤ n ≤ 49). 输出 Print n lines…