蓝桥杯刷题-游戏

1388. 游戏 - AcWing题库

#include 
 
using namespace std;
const int N = 110;
int n , s[N];
int f[N][N][2];
int a[N];
 
int sum(int l, int r)
{
    return s[r] - s[l - 1];
}
 
int main()
{
    cin >> n;
    for(int i = 1;i <= n;i ++)
    {
        cin >> a[i];
        s[i] = s[i - 1] + a[i];
    }
 
    for(int i = 1;i <= n;i ++)
    {
        f[i][i][0] = a[i];
        f[i][i][1] = a[i];
        f[i][i + 1][0] = max(a[i] , a[i + 1]);
        f[i][i + 1][1] = max(a[i] , a[i + 1]);
    }
 
    for(int i = n;i >= 1;i --)
    {
        for(int j = i + 1;j <= n; j ++)
        {
            for(int k = 0;k <= 1;k ++)
            {
                f[i][j][k] = max(f[i][j][k] , sum(i , j - 1)
                - f[i][j - 1][1 - k] + a[j]);
 
                f[i][j][k] = max(f[i][j][k] , sum(i + 1 , j)
                - f[i + 1][j][1 - k] + a[i]);
            }
        }
    }
    cout << f[1][n][0] << ' ' << sum(1 , n) - f[1][n][0] << endl;
    return 0;
}