Codeforces Educational Codeforces Round 44 (Rated for Div. 2) F. Isomorphic Strings 题目连接: http://codeforces.com/contest/985/problem/F Description You are given a string s of length n consisting of lowercase English letters. For two given strings s an…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) E. Pencils and Boxes 题目连接: http://codeforces.com/contest/985/problem/E Description Mishka received a gift of multicolored pencils for his birthday! Unfortunately he lives in a monochrome w…

题目链接:https://codeforc.es/contest/1076 A. Minimizing the String 题意:给出一个字符串,最多删掉一个字母,输出操作后字典序最小的字符串. 题解:若存在一个位置 i 满足 a[i] > a[i+1],若不删除 a[i] 则后续操作不可能更优. #include <bits/stdc++.h> using namespace std; #define ll long long #define ull unsigned long lo…

传送门 Div 2的比赛,前四题还有那么多人过,应该是SB题,就不讲了. 这场比赛一堆计数题,很舒服.(虽然我没打) E. The Top Scorer 其实这题也不难,不知道为什么这么少人过. 考虑枚举那人的分数和有多少人和他同分,推一下就会发现我们只需要知道\(calc(sum,n,top)\)表示\(sum\)分,分给\(n\)个人,分数小于\(top\),的方案数. 好像不是很好直接搞,考虑容斥,枚举一下至少有几个人不满足条件即可. #include<bits/stdc++.h> na…

E. Sum of Remainders 题目连接: http://www.codeforces.com/contest/616/problem/E Description The only line contains two integers n, m (1 ≤ n, m ≤ 1013) - the parameters of the sum. input The only line contains two integers n, m (1 ≤ n, m ≤ 1013) - the para…

D. Longest k-Good Segment 题目连接: http://www.codeforces.com/contest/616/problem/D Description The array a with n integers is given. Let's call the sequence of one or more consecutive elements in a segment. Also let's call the segment k-good if it conta…

C. The Labyrinth 题目连接: http://www.codeforces.com/contest/616/problem/C Description You are given a rectangular field of n × m cells. Each cell is either empty or impassable (contains an obstacle). Empty cells are marked with '.', impassable cells are…

B. Dinner with Emma 题目连接: http://www.codeforces.com/contest/616/problem/A Description Jack decides to invite Emma out for a dinner. Jack is a modest student, he doesn't want to go to an expensive restaurant. Emma is a girl with high taste, she prefer…

A. Comparing Two Long Integers 题目连接: http://www.codeforces.com/contest/616/problem/A Description You are given two very long integers a, b (leading zeroes are allowed). You should check what number a or b is greater or determine that they are equal.…

E. Minimum spanning tree for each edge 题目连接: http://www.codeforces.com/contest/609/problem/E Description Connected undirected weighted graph without self-loops and multiple edges is given. Graph contains n vertices and m edges. For each edge (u, v) f…