Submission #537977

#	Time	Username	Problem	Language	Result	Execution time	Memory
537977		thegrimbee	Martian DNA (BOI18_dna)	C++14	0 / 100	24 ms	4052 KiB

dna

#include<bits/stdc++.h>
using namespace std;
#define int long long
bool debug = false;
signed main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	int n, k, r, temp; cin >> n >> k >> r;
	vector<int> v(n);
	for (int i = 0 ;i < n; ++i){
		cin >> v[i];
	}
	vector<int> val(k, 1e9+7);
	for (int i = 0;i < r; ++i){
		cin >> temp;
		cin >> val[temp];
	}
	int lo = 1, hi = n, mid = (lo + hi)/2;
	while (temp!=r && mid != n){
		if(debug) cout << mid << '\n';
		temp = 0;
		vector<int> cur(n, 0);
		for (int i = 0; i < mid; ++i){
			cur[v[i]]++;
			if(cur[v[i]] == val[v[i]])temp++;
		}
		if(temp == r){
			hi = mid;
			mid = (lo + hi)/2;
			continue;
		}
		for (int i = mid; i < n; ++i){
			cur[v[i]]++;
			cur[v[i-mid]]--;
			if (v[i] != v[i-mid]){
				if(cur[v[i]] == val[v[i]])temp++;
				if (cur[v[i-mid]] == val[v[i-mid]]-1)temp--;
			}
			if(temp == r){
				hi = mid;
				mid = (lo + hi)/2;
				continue;
			}
		}
		lo = mid+1;
		mid = (lo + hi)/2;
	}
	if (temp != r && mid == n)cout << "impossible";
	else cout << mid;

}

• Subtask 1: 0 / 16
• Subtask 2: 0 / 24
• Subtask 3: 0 / 28
• Subtask 4: 0 / 32