摘要：
B. Merge it! You are given an array aanna1,a2,…,ana1,a2,…,an In one operation you can choose two elements of the array and replace them with the eleme 阅读全文
摘要：
Divide it! You are given an integer nn. You can perform any of the following operations with this number an arbitrary (possibly, zero) number of times 阅读全文