Submission #1121910

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121910		_callmelucian	Martian DNA (BOI18_dna)	C++14	100 / 100	24 ms	4092 KiB

dna

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

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pl;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tpl;

#define all(a) a.begin(), a.end()
#define filter(a) a.erase(unique(all(a)), a.end())

const int mn = 2e5 + 5;
int a[mn], delta[mn];

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    int n, k, r; cin >> n >> k >> r;
    for (int i = 1; i <= n; i++) cin >> a[i];
    for (int i = 0; i < r; i++) {
        int b, q; cin >> b >> q;
        delta[b] = -q;
    }

    int start = 0;
    for (int i = 0; i < k; i++) {
        while (start + 1 <= n && delta[i] < 0) delta[a[++start]]++;
        if (delta[i] < 0) return cout << "impossible", 0;
    }

    int ans = start;
    for (int L = 1, R = start; R <= n; R++) {
        if (R != start) delta[a[R]]++;
        while (L < R && delta[a[L]] > 0) delta[a[L++]]--;
        ans = min(ans, R - L + 1);
    }
    cout << ans;

    return 0;
}

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