Submission #941046

#	Time	Username	Problem	Language	Result	Execution time	Memory
941046		juliany2	Chorus (JOI23_chorus)	C++17	40 / 100	57 ms	2524 KiB

chorus

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) (x).begin(), (x).end()

const int N = 507;
int n, k;
string s;
int a[N];
int dp[N][N];

int main() {
    cin.tie(0)->sync_with_stdio(false);

    cin >> n >> k >> s;
    s = " " + s;

    int idx = 1, cnt = 1;
    for (int i = 1; i <= 2 * n; i++) {
        if (s[i] == 'A')
            cnt++;
        else
            a[idx++] = cnt;
    }

    memset(dp, 0x3f, sizeof(dp));
    dp[1][0] = 0;

    for (int i = 2; i <= n + 1; i++) {
        int sum = 0;
        for (int j = i - 1; j >= 1; j--) {
            sum += max(0, i - a[j]);
            for (int c = 1; c <= k; c++)
                dp[i][c] = min(dp[i][c], dp[j][c - 1] + sum);
        }
    }

    cout << *min_element(dp[n + 1], dp[n + 1] + k + 1) << '\n';

    return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 0 / 21
• Subtask 4: 0 / 26
• Subtask 5: 0 / 13