题目 | Add, Divide and Floor
Educational Codeforces Round 158 (Rated for Div. 2)
C. Add, Divide and Floor
题目 | Neutral Tonality
题目 | Salyg1n and Array
Codeforces Round 897 (Div. 2)
E1. Salyg1n and Array (simple version)
E2. Salyg1n and Array (hard version)
https://codeforces.com/contest/1867/problem/E1
题目 | Cyclic Operations
题目 | Candy Party
Codeforces Round 896 (Div. 2)
D1. Candy Party (Easy Version)
D2. Candy Party (Hard Version)
https://codeforces.com/contest/1869/problem/D1