Submission #537991

#	Time	Username	Problem	Language	Result	Execution time	Memory
537991		thegrimbee	Martian DNA (BOI18_dna)	C++14	100 / 100	63 ms	6484 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;
		bool found = false;
		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 = 0, hi = n+1, mid = (lo + hi)/2;
		temp = 0;
		while (lo < hi-1){
			if(debug) cout << lo << ' ' << mid << ' ' << hi << "    ";
			temp = 0;
			found = false;
			vector<int> cur(n, 0);
			for (int i = 0; i < mid; ++i){
				cur[v[i]]++;
				if(cur[v[i]] == val[v[i]])temp++;
			}
			if(debug)cout << temp << ' ';
			if(temp == r){
				hi = mid;
				mid = (lo + hi)/2;
				if(debug)cout <<'\n';
				continue;
			}
			for (int i = mid; i < n && !found; ++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(debug)cout << temp << ' ' ;
				if(temp == r){
					hi = mid;
					mid = (lo + hi)/2;
					if(debug)cout<<'\n';
					found = true;
					continue;
				}
			}
			if(found)continue;
			if(debug)cout<<'\n';
			lo = mid;
			mid = (lo + hi)/2;
		}
		if(debug)cout << temp << ' ';
		if (temp != r && hi == n+1)cout << "impossible";
		else cout << hi;

	}

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