Submission #526276

#	Time	Username	Problem	Language	Result	Execution time	Memory
526276		bebecanvas	Martian DNA (BOI18_dna)	C++14	0 / 100	38 ms	6676 KiB

dna

#include <bits/stdc++.h>

using namespace std;
#define int long long
#define endl '\n'
#define sz(x) (int) (x).size()

signed main(){
 
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
	int n, k, r; cin >> n >> k >> r;
	int v[200005];
	int arr[200005];
	for(int i=0; i<n; i++){cin >> arr[i];}
	for(int i=0; i<=k; i++){v[i]= 1;}
	for(int i=0; i<r; i++){
		int a, b; cin >> a >> b;
		v[a]= b;
	}
	
	int s= 1;
	int e= n;
	bool yeaa= false;
	while(s<e){
		int mid= s+ (e-s)/2;
		int c[200005]={0};
		int count= 0;
		for(int i=0; i<mid; i++){
			c[arr[i]]++;
			if(c[arr[i]]==v[arr[i]]){count++;}
		}
		bool yea= false;
		if(count==k){yea= true;}
		for(int i=0; i<n- mid; i++){
			if(count==k){yea= true; yeaa= true; break;}
			c[arr[i]]--;
			if(c[arr[i]]==v[arr[i]]){count++;}
			if(c[arr[i]]==v[arr[i]]-1){count--;}
			c[arr[i+mid]]++;
			if(c[arr[i+mid]]==v[arr[i+mid]]-1){count++;}
			if(c[arr[i+mid]]==v[arr[i+mid]]-1){count--;}
		}
		if(count==k){yea= true; yeaa= true;}
		if(yea){e= mid;}
		else{s= mid+1;}
	}
	
	if(yeaa){cout << e << endl;}
	else{cout << "impossible" << endl;}
	
	
}

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