Submission #61548559

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#include<bits/stdc++.h>
#define int long long
#define For(i, a, b) for(int i = (a); i <= (b); i++)
#define Rof(i, a, b) for(int i = (a); i >= (b); i--)
using namespace std;
const int N = 5e5 + 5;
int n, ans, a[N];
void Solve(){
  cin >> n;
  For(i, 1, n) cin >> a[i];
  int j = 0;
  For(i, 1, n){
    while(j < i && a[j + 1] * 2 <= a[i]) j++;
    ans += j;
  }
  cout << ans << '\n';
}
signed main(){
  cin.tie(0)->sync_with_stdio(0);
  int T = 1; //cin >> T;
  while(T--) Solve();
 
 
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#include<bits/stdc++.h>
#define int long long
#define For(i, a, b) for(int i = (a); i <= (b); i++)
#define Rof(i, a, b) for(int i = (a); i >= (b); i--)
using namespace std;
const int N = 5e5 + 5;
int n, ans, a[N];
void Solve(){
	cin >> n;
	For(i, 1, n) cin >> a[i];
	int j = 0;
	For(i, 1, n){
		while(j < i && a[j + 1] * 2 <= a[i]) j++;
		ans += j;
	}
	cout << ans << '\n';
}
signed main(){
	cin.tie(0)->sync_with_stdio(0);
	int T = 1; //cin >> T;
	while(T--) Solve();
	return 0;
}

Submission Info

Judge Result