Submission #768313

#	Time	Username	Problem	Language	Result	Execution time	Memory
768313		Yell0	Martian DNA (BOI18_dna)	C++17	100 / 100	68 ms	9236 KiB

dna

#include <bits/stdc++.h>

using namespace std;
const int MN=2e5+2;
int N,K,R,d[MN],req[MN],f[MN];

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  cin>>N>>K>>R;
  for(int i=1;i<=N;++i) cin>>d[i];
  set<int> needs;
  for(int i=1;i<=R;++i) {
    int b,q;
    cin>>b>>q;
    req[b]=q;
    needs.insert(b);
  }
  int l=1,r=1;
  for(;r<=N;++r) {
    if(needs.empty()) break;
    if(++f[d[r]]==req[d[r]]) needs.erase(d[r]);
  }
  if(r>N&&needs.size()) {
    cout<<"impossible\n";
    return 0;
  }
  int ans=r-l;
  for(;l<=N;++l) {
    --f[d[l]];
    while(f[d[l]]<req[d[l]]) {
      if(r>N) {
        cout<<ans<<'\n';
        return 0;
      }
      ++f[d[r]];
      ++r;
    }
    ans=min(ans,r-l-1);
  }
  cout<<ans<<'\n';
  return 0;
}

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