Submission #933253

#	Time	Username	Problem	Language	Result	Execution time	Memory
933253		LucaIlie	Martian DNA (BOI18_dna)	C++17	100 / 100	72 ms	4692 KiB

dna

#include <bits/stdc++.h>

using namespace std;

const int MAX_N = 2e5;
const int MAX_K = MAX_N;

int v[MAX_N], f[MAX_K], q[MAX_K];

int cond;

void add( int i ) {
    f[v[i]]++;
    if ( f[v[i]] == q[v[i]] )
        cond++;
}

void rem( int i ) {
    if ( f[v[i]] == q[v[i]] )
        cond--;
    f[v[i]]--;
}

int main() {
    int n, k, m;

    cin >> n >> k >> m;
    for ( int i = 0; i < n; i++ )
        cin >> v[i];
    for ( int i = 0; i < m; i++ ) {
        int b;
        cin >> b;
        cin >> q[b];
    }

    cond = k - m;
    int l = 0, minLen = n + 1;
    for ( int r = 0; r < n; r++ ) {
        add( r );
        while ( cond >= k && l <= r ) {
            rem( l );
            l++;
        }
        if ( l > 0 ) {
            l--;
            add( l );
        }
        if ( cond >= k )
            minLen = min( minLen, r - l + 1 );
    }

    if ( minLen == n + 1 )
        cout << "impossible\n";
    else
        cout << minLen << "\n";

    return 0;
}

• Subtask 1: 16 / 16
• Subtask 2: 24 / 24
• Subtask 3: 28 / 28
• Subtask 4: 32 / 32