动态规划-最长上升子序列

#include <iostream>
using namespace std;

const int N = 1010;

int n;
int a[N], f[N];

int main()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)   cin >> a[i];
    
    for (int i = 1; i <= n; ++ i)
    {
        f[i] = 1;
        for (int j = 1; j < i; ++ j)
        {
            if (a[j] < a[i])    f[i] = max(f[i], f[j] + 1);
        }
    }
    
    int res = 0;
    for (int i = 1; i <= n; ++ i)   res = max(res, f[i]);
    
    cout << res << endl;
    
    return 0;
}