摘要: A 按照题意直接求和即可 #include<bits/stdc++.h> #define N 1100000 #define db double #define ll long long #define ldb long double #define ull unsigned long long u 阅读全文
posted @ 2020-12-15 15:46 Creed-qwq 阅读(2000) 评论(0) 推荐(3) 编辑