Codeforces Round #400 (Div. 1 + Div. 2, combined) C. Molly’s Chemicals 区间和、构造、前缀的后缀
C. Molly's Chemicals 区间和、构造、前缀的后缀 My Solution 题意:给出n个数字,要求选出一段连续…
C. Molly's Chemicals 区间和、构造、前缀的后缀 My Solution 题意:给出n个数字,要求选出一段连续…
D. Anton and School - 2 前缀的后缀、 范德蒙恒等式、容斥 My Solution 题意:给出一个只有"("和“)…