Submission #1035557

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035557		tvladm2009	Cigle (COI21_cigle)	C++17	100 / 100	215 ms	117644 KiB

cigle

#include <bits/stdc++.h>
 
using namespace std;
 
#define x first
#define y second
#define sz(a) a.size()

typedef long long ll;

const int N = 5e3 + 7;

int a[N];
ll dp[N][N], mx[N];

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= i - 1; j++) {
            mx[j] = dp[j][i - 1];
        }
        for (int j = 1; j <= i - 1; j++) {
            mx[j] = max(mx[j], mx[j - 1]);
        }
        ll sa = 0;
        ll sb = 0;
        ll x = 0;
        int cnt = 0;
        int pos = i - 1;
        for (int j = i; j <= n; j++) {
            sb += a[j];
            while (pos >= 1 && sa < sb) {
                sa += a[pos];
                pos--;
            }
            if (pos > 0 && sa == sb) {
                cnt++;
                x = max(x, mx[pos] + cnt);
            }
            dp[i][j + 1] = x;
        }
    }
    ll ans = 0;
    for (int i = 1; i <= n; i++) 
        ans = max(ans, dp[i][n]);
    cout << ans << "\n";
    return 0;
}
 

• Subtask 1: 9 / 9
• Subtask 2: 11 / 11
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 52 / 52