Submission #788329

#	Time	Username	Problem	Language	Result	Execution time	Memory
788329		someone	Chorus (JOI23_chorus)	C++14	40 / 100	120 ms	2456 KiB

chorus

#include <bits/stdc++.h>
#define int long long
using namespace std;

const int N = 5e2 + 42, INF = 1e18 + 42;

vector<int> a, pre;
int n, k, x = 0, cumul[N], fi[N], dp[N][N];

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> n >> k;
    for(int i = 0; i < N; i++)
        fi[i] = N-1;
    for(int i = 0; i < 2*n; i++) {
        char c; cin >> c;
        if(c == 'A') {
            if(fi[x] == N-1)
                fi[x] = (int)a.size();
            a.push_back(i);
            pre.push_back(x);
        } else {
            x++;
        }
    }
    for(int i = n-1; i > -1; i--)
        if(fi[i] == N-1)
            fi[i] = fi[i+1];

    for(int i = 1; i <= n; i++)
        cumul[i] = cumul[i-1] + pre[i-1];
    for(int i = 1; i <= n; i++)
        dp[0][i] = INF;
    for(int nbG = 1; nbG <= k; nbG++) {
        for(int i = 1; i <= n; i++) {
            dp[nbG][i] = INF;
            for(int j = 0; j < i; j++)
                dp[nbG][i] = min(dp[nbG][i], dp[nbG-1][j] - (max(i, fi[j]) - max(j, fi[j])) * j + cumul[max(i, fi[j])] - cumul[max(j, fi[j])]);
        }
    }
    cout << dp[k][n] << '\n';
}

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