This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<iostream>
#include<algorithm>
#include<vector>
#define MAX 500005
using namespace std;
int n, x, soll, solr, sol;
int arr[MAX], indx[MAX], lef[MAX], righ[MAX];
vector<vector<int> > a;
int main() {
cin.sync_with_stdio(0); cin.tie(0);
cin.exceptions(cin.failbit);
cin >> n; a.resize(n*2+1);
for(int i=1;i<=n;i++) {
cin >> arr[i];
indx[arr[i]] = i;
a[i+arr[i]].push_back(i);
}
for(int i=0;i<a.size();i++) sort(a[i].begin(),a[i].end());
for(int i=1;i<=n;i++) righ[i] = righ[i-1]+(arr[i]==i);
for(int i=n;i>0;i--) lef[i] = lef[i+1]+(arr[i]==i);
for(int i=1;i<=n;i++) {
int l=i, r=indx[i]; if(r<l) swap(r,l);
int f = (upper_bound(a[l+r].begin(),a[l+r].end(),r) - lower_bound(a[l+r].begin(),a[l+r].end(),l));
if(righ[l]+lef[r]+f > sol) {soll = l; solr = r; sol = righ[l]+lef[r]+f;}
}
cout << arr[soll] << " " << arr[solr];
return 0;
}
Compilation message (stderr)
doktor.cpp: In function 'int main()':
doktor.cpp:21:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<a.size();i++) sort(a[i].begin(),a[i].end());
~^~~~~~~~~
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