Submission #862878

#	Time	Username	Problem	Language	Result	Execution time	Memory
862878		iskhakkutbilim	Martian DNA (BOI18_dna)	C++17	100 / 100	28 ms	5844 KiB

dna

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

#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int N = 2e5;

int n, k, q;
vector<int> a;
vector<pair<int, int> > query;
int nuk[N+10], need[N + 10];



main(){
   ios::sync_with_stdio(0);
   cin.tie(0); cout.tie(0);
	cin >> n >> k >> q;
	a.resize(n);
	for(int i = 0;i < n; i++){
		cin >> a[i];
		nuk[a[i]]++;
	}
	for(int i = 0;i < q; i++){
		int c, cnt; cin >> c >> cnt;
		query.push_back({c, cnt});
		need[c] = cnt;
	}
	for(auto [c, cnt] : query){
		if(nuk[c] < cnt){
			cout << "impossible";
			return 0;
		}
	}
	for(int i = 0;i < n; i++) nuk[a[i]] = 0;
	int ans = n, ok = 0;
	for(int l = 0, r = 0; l < n; l++){
		while(r < n && ok < q){
			nuk[a[r]]++;
			if(nuk[a[r]] == need[a[r]]){
				ok++;
			}
			r++;
		}
		if(ok > q) assert(false);
		if(ok == q){
			ans = min(ans, r - l);
		}
		if(nuk[a[l]] == need[a[l]]){
			ok--;
		}
		nuk[a[l]]--;
	}
	cout << ans;
	return 0;
}

Compilation message (stderr)

dna.cpp:16:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   16 | main(){
      | ^~~~

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