摘要：
Pikachu had an array with him. He wrote down all the non-empty subsequences of the array on paper. Note that an array of size n has 2n - 1 non-empty s 阅读全文
摘要：
You are given two arrays A and B, each of size n. The error, E, between these two arrays is defined . You have to perform exactly k1 operations on arr 阅读全文
摘要：
A. Equator Polycarp has created his own training plan to prepare for the programming contests. He will train for nn days, all days are numbered from 1 阅读全文