摘要: 传送门 A - Circle Pond #include <bits/stdc++.h> #define ll long long using namespace std; int main() { int n; scanf("%d", &n); printf("%.6f\n", 2.0 * aco 阅读全文
posted @ 2020-04-20 12:17 zdragon 阅读(472) 评论(5) 推荐(1) 编辑