Submission #330266

#	Time	Username	Problem	Language	Result	Execution time	Memory
330266		nandonathaniel	Martian DNA (BOI18_dna)	C++14	100 / 100	134 ms	12672 KiB

dna

#include<bits/stdc++.h>
using namespace std;
 
int mini[200005],byk[200005];
int s[200005];

int main(){
	ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    int n,k,r,x,y;
    cin >> n >> k >> r;
    for(int i=0;i<n;i++)cin >> s[i];
    for(int i=1;i<=r;i++){
    	cin >> x >> y;
    	mini[x]=y;
	}
	set<int> valid;
	for(int i=0;i<k;i++){
		if(mini[i]==0)valid.insert(i);
	}
	int ans=n+1,awal=0,akhir=0;
    byk[s[0]]++;
    if(byk[s[0]]==mini[s[0]])valid.insert(s[0]);
    while(awal<=akhir && akhir<n){
    	bool stat=(valid.size()==k);
    	if(!stat){
    		if(akhir<n-1){
    			akhir++;
    			byk[s[akhir]]++;
    			if(byk[s[akhir]]==mini[s[akhir]])valid.insert(s[akhir]);
			}
			else break;
		}
		else{
			ans=min(ans,akhir-awal+1);
			byk[s[awal]]--;
			if(byk[s[awal]]==mini[s[awal]]-1)valid.erase(s[awal]);
			awal++;
		}
	}
	if(ans==n+1)cout << "impossible\n";
	else cout << ans << '\n';
	return 0;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:24:29: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |      bool stat=(valid.size()==k);
      |                 ~~~~~~~~~~~~^~~

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