Submission #1040138

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040138		TAhmed33	Cat Exercise (JOI23_ho_t4)	C++98	21 / 100	87 ms	166520 KiB

Main

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 5e3 + 25;
int a[MAXN], n;
int dp[MAXN][MAXN];
int mx[MAXN][MAXN];
void solve () {
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int l = n; l >= 1; l--) {
        mx[l][l] = l;
        dp[l][l] = 0;
        for (int r = l + 1; r <= n; r++) {
            if (a[mx[l + 1][r]] > a[mx[l][r - 1]]) {
                mx[l][r] = mx[l + 1][r];
            } else {
                mx[l][r] = mx[l][r - 1];
            }
            int x = 0;
            if (mx[l][r] != r) {
                x = mx[mx[l][r] + 1][r] - mx[l][r];
            }
            int y = 0;
            if (mx[l][r] != l) {
                y = mx[l][r] - mx[l][mx[l][r] - 1];
            }
            dp[l][r] = max(x + dp[mx[l][r] + 1][r], y + dp[l][mx[l][r] - 1]);
        }
    }
    cout << dp[1][n] << '\n';
}       
signed main () {
    ios::sync_with_stdio(0); cin.tie(0);
    int tc = 1; //cin >> tc;
    while (tc--) solve();
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 20
• Subtask 6: 0 / 23
• Subtask 7: 0 / 26