Submission #1124527

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124527		username_____here	Martian DNA (BOI18_dna)	C++20	100 / 100	29 ms	2632 KiB

dna

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> veci;
typedef vector<ll> vecll;
#define fi first
#define se second
#define debug(x) cerr<<# x<<" is "<<x<<'\n'
#define vec vector
#define pq priority_queue

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	int n, k, r;
    cin >> n >> k >> r;
    int d[n], req[k]={0}, i;
    for (i=0; i<n; i++) {
        cin >> d[i];
    }
    for (i=0; i<r; i++) {
        int b, q;
        cin >> b >> q;
        req[b] = q;
    }
    int cnt[k]={0}, f=0, ans=INT_MAX;
    int left=0, right=0;
    cnt[d[0]]++;
    if (cnt[d[0]] == req[d[0]]) {
        f++;
    }
    while (right<n) {
        if (f!=r) {
            right++;
            if (right>=n) break;
            cnt[d[right]]++;
            if (cnt[d[right]] == req[d[right]]) {
                f++;
            }
        } else {
            //cout << "hi\n";
            ans = min(ans, (right-left+1));
            if (ans==1) break;
            left++;
            cnt[d[left-1]]--;
            if (cnt[d[left-1]] == req[d[left-1]]-1) {
                f--;
            }
        }
    }
    cout << (ans==INT_MAX ? "impossible" : to_string(ans));
	return 0;
}

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