标签:题意 代码 its ref div href test 删除 names
题目链接:https://codeforces.com/contest/1372/problem/D
给出奇数个数围成的环,每次可以将一个数替换为相邻两个数的和并删除相邻的两个数,问最后余下的数的最大值。
即从 $n$ 个数中选取 $\frac{n+1}{2}$ 个数,且这些数中最多有一对数相邻的和的最大值。
#include <bits/stdc++.h> using ll = long long; using namespace std; int main() { int n; cin >> n; int a[n] = {}; ll sum = 0, now = 0; for (int i = 0; i < n; i++) { cin >> a[i]; sum += a[i]; if (i % 2 == 0) now += a[i]; } ll ans = now; for (int i = 1; i < n; i++) { now = sum - now + a[i - 1]; ans = max(ans, now); } cout << ans << "\n"; }
Codeforces Round #655 (Div. 2) D. Omkar and Circle
标签:题意 代码 its ref div href test 删除 names
原文地址:https://www.cnblogs.com/Kanoon/p/13289939.html