Submission #82242

#	Time	Username	Problem	Language	Result	Execution time	Memory
82242		Genezio	Doktor (COCI17_doktor)	C++14	60 / 100	289 ms	41184 KiB

doktor

#include<bits/stdc++.h>

using namespace std;
#define pii pair<int,int>
#define mp make_pair
#define F first
#define S second
#define pb push_back
#define ll long long

const int N = 500010;
const int INF = 0x3f3f3f3f;
const ll mod = 1e9+7;

 pii ans;
 int m;
 vector<int> e[N];
 vector<int> o[N];
 int v[N];
 int pre[N];
 int pos[N];

int main() {
	ios::sync_with_stdio(false);
 	cin.tie(0);
    int n,t=0;
    int ptfix=-1;
    cin>>n;
    for(int i=1;i<=n;i++) {
        cin>>v[i];
        pre[i]=pre[i-1];
        if(v[i]==i) ptfix=i,pre[i]++;
        if(abs(v[i]-i)%2) {
        	e[(v[i]+i)>>1].push_back(i);
        	//pos[i]=e[(v[i]+i)>>1].size();
        } else {
        	o[(v[i]+i)>>1].push_back(i);
        	//pos[i]=e[(v[i]+i)>>1].size();
        }
    }
    for(int i=1;i<=n;i++) {
  		if(abs(v[i]-i)%2) {
  			vector<int>::iterator it = lower_bound(e[(v[i]+i)>>1].begin(),e[(v[i]+i)>>1].end(),max(v[i],i));
  			vector<int>::iterator hit = lower_bound(e[(v[i]+i)>>1].begin(),e[(v[i]+i)>>1].end(),min(v[i],i)-1);
  			int a=it-hit+1;
  			//cout<<i<<" "<<a<<" ";
  			a-=(pre[max(v[i],i)]-pre[min(v[i],i)-1]);
  			//cout<<a<<"\n";
  			if(a>m) {
  				m=a;
  				if(v[i]>i) {
  					ans.F=v[i];
  					ans.S=v[v[i]];
  				} else {
  					ans.F=v[v[i]];
  					ans.S=v[i];
  				}
  			}
 		} else {
 			vector<int>::iterator it = lower_bound(o[(v[i]+i)>>1].begin(),o[(v[i]+i)>>1].end(),max(v[i],i));
 			vector<int>::iterator hit = lower_bound(o[(v[i]+i)>>1].begin(),o[(v[i]+i)>>1].end(),min(v[i],i)-1);
  			int a=it-hit+1;
  			//cout<<i<<" "<<a<<" ";
  			a-=(pre[max(v[i],i)]-pre[min(v[i],i)-1]);
  			if(v[(v[i]+1)>>1]==(v[i]+1)>>1) a++;
  			//cout<<a<<"\n";
  			if(a>m) {
  				m=a;
  				if(v[i]>i) {
  					ans.F=v[i];
  					ans.S=v[v[i]];
  				} else {
  					ans.F=v[v[i]];
  					ans.S=v[i];
  				}
  			}
 		}
    }
    if(m) {
    	cout<<ans.F<<" "<<ans.S<<"\n";
    } else {
    	cout<<ptfix<<" "<<ptfix<<"\n";
    }
}

Compilation message (stderr)

doktor.cpp: In function 'int main()':
doktor.cpp:26:11: warning: unused variable 't' [-Wunused-variable]
     int n,t=0;
           ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10