Submission #643394

#	Time	Username	Problem	Language	Result	Execution time	Memory
643394		devariaota	Martian DNA (BOI18_dna)	C++17	68 / 100	2065 ms	21132 KiB

dna

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
const ll MOD=1e9+7;
using namespace std;
ll N,M,K,a[200005];
vector <ll> vec[200005];
vector <pair<ll,ll> > pr[200005];
int main(){
  cin>>N>>M>>K;
  for(int i=1;i<=N;i++){
    cin>>a[i];
    vec[a[i]].push_back(i);
  }
  bool ok=true;
  for(int i=1;i<=K;i++){
    ll x,y;
    cin>>x>>y;
//    cout<<vec[x].size()<<' '<<y<<endl;
    if(vec[x].size()<y){
      ok=false;
    }
    else{
      for(int j=y-1;j<vec[x].size();j++){
        pr[i].push_back({vec[x][j-(y-1)],vec[x][j]});
      }
    }
  }
  if(!ok){
    cout<<"impossible"<<endl;
    return 0;
  }
  ll minn=1e18;
  for(int i=1;i<=N;i++){
    ll maks=0;
    bool ok=true;
    for(int j=1;j<=K;j++){
      ll l=0;
      ll r=pr[j].size()-1;
      ll ans=-1;
      while(l<=r){
        ll m=(l+r)/2;
        if(pr[j][m].fi>=i){
          ans=m;
          r=m-1;
        }
        else{
          l=m+1;
        }
      }
      if(ans==-1){
        ok=false;
        break;
      }
      maks=max(maks,pr[j][ans].se);
    }
    if(ok){
      minn=min(minn,maks-i+1);
    }
  }
  cout<<minn<<endl;
}

Compilation message (stderr)

dna.cpp: In function 'int main()':
dna.cpp:22:21: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   22 |     if(vec[x].size()<y){
      |        ~~~~~~~~~~~~~^~
dna.cpp:26:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |       for(int j=y-1;j<vec[x].size();j++){
      |                     ~^~~~~~~~~~~~~~

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