Submission #593136

#	Time	Username	Problem	Language	Result	Execution time	Memory
593136		piOOE	Group Photo (JOI21_ho_t3)	C++17	0 / 100	0 ms	320 KiB

Main

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    cin >> n;
    vector<int> a(n), pl(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        --a[i];
    }
    for (int i = 0; i < n; ++i) {
        int cnt = 0;
        for (int j = 0; j < n; ++j) {
            if (a[j] >= i) {
                ++cnt;
            }
            if (a[j] == i) {
                pl[i] = cnt;
                break;
            }
        }
    }
    vector<vector<int>> dp(n, vector<int>(n + 1));
    dp[n - 1][1] = 0;
    for (int x = n - 2; x >= 0; --x) {
        dp[x][1] = n * n;
        for (int cnt = 1; cnt + 1 + x <= n; ++cnt) {
            dp[x][1] = min(dp[x][1], dp[x + 1][cnt] + abs(pl[x] - 1));
        }
        for (int cnt = 2; x + cnt <= n; ++cnt) {
            dp[x][cnt] = dp[x + 1][cnt - 1] + abs(pl[x] - cnt);
        }
    }
    int ans = n * n;
    for (int i = 1; i <= n; ++i) {
        ans = min(ans, dp[0][i]);
    }
    cout << ans;
    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 32
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36