Submission #89559

#	Time	Username	Problem	Language	Result	Execution time	Memory
89559		sjhuang26	Global Warming (NOI13_gw)	C++14	29 / 40	635 ms	33768 KiB

gw

#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
typedef pair<int,int>ii;
int N,a[1000000],ch=0,ans=-1;
vector<ii>b;
//0=land,1=no land
bool f[1000000]={};
int main(){
  cin>>N;
  for(int i=0;i<N;++i){
    cin>>a[i];
    b.push_back({a[i],i});
  }
  sort(b.begin(),b.end());
  if(b[0].first>0)ans=1;
  for(int i=0;i<N;++i){
    int x=b[i].second;
    if(x!=0)ch+=(f[x]==f[x-1]?1:-1);
    if(x!=N-1)ch+=(f[x]==f[x+1]?1:-1);
    f[x]=1;
    if((i==N-1)||(b[i].first!=b[i+1].first)){
      int isl;
      if(f[0]){
        //011223344...
        isl=ch/2+ch%2;
      }else{
        //112233445...
        isl=ch/2+1;
      }
      ans=max(ans,isl);
    }
  }
  cout<<ans<<'\n';return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 7 / 7
• Subtask 4: 10 / 10
• Subtask 5: 0 / 11