摘要：
链接: https://codeforces.com/contest/1228/problem/B 题意: Suppose there is a h×w grid consisting of empty or full cells. Let's make some definitions: ri i 阅读全文
摘要：
链接: https://codeforces.com/contest/1228/problem/A 题意: You have two integers l and r. Find an integer x which satisfies the conditions below: l≤x≤r. Al 阅读全文
摘要：
链接: https://codeforces.com/contest/1234/problem/E 题意: Let's define pi(n) as the following permutation: [i,1,2,…,i−1,i+1,…,n]. This means that the i th 阅读全文
摘要：
链接: https://codeforces.com/contest/1234/problem/D 题意: You are given a string s consisting of lowercase Latin letters and q queries for this string. Re 阅读全文