Submission #890934

#	Time	Username	Problem	Language	Result	Execution time	Memory
890934		LCJLY	Martian DNA (BOI18_dna)	C++14	100 / 100	30 ms	5116 KiB

dna

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

#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl; 
#define show4(x,y) for(auto it:x) cout << it << " "; cout << #y << endl;
typedef pair<int,int>pii;
typedef pair<pii,int>pi2;

void solve(){		
	int n,k,r;
	cin >> n >> k >> r;
	
	int arr[n];
	for(int x=0;x<n;x++){
		cin >> arr[x];
	}
	
	int need[n];
	memset(need,-1,sizeof(need));
	int temp,temp2;
	for(int x=0;x<r;x++){
		cin >> temp >> temp2;
		need[temp]=temp2;
	}
	
	int l=0;
	
	int done=0;
	int cnt[n];
	memset(cnt,0,sizeof(cnt));
	int best=LONG_LONG_MAX;
	for(int x=0;x<n;x++){
		//include x
		int val=arr[x];
		cnt[val]++;
		if(cnt[val]==need[val]) done++;
		
		while(done==r){
			best=min(best,x-l+1);
			int cur=arr[l];
			if(cnt[cur]==need[cur]) done--;
			cnt[cur]--;
			l++;
		}
	}
	
	
	if(best==LONG_LONG_MAX){
		cout << "impossible\n";
	}
	else cout << best;
	
	
}	

int32_t main(){										
	ios::sync_with_stdio(0);	
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

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