제출 #1294192

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1294192		avighna	Pairs (IOI07_pairs)	C++20	0 / 100	15 ms	580 KiB

pairs

#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);

  int b;
  cin >> b;
  if (b == 1) {
    int n, d;
    cin >> n >> d;
    vector<int> a(n);
    for (int &i : a) {
      cin >> i;
    }
    sort(a.begin(), a.end());
    int64_t ans = 0;
    for (int i = 0, ptr1 = 0, ptr2 = 0; i < n; ++i) {
      while (ptr1 < n && a[i] - a[ptr1] > d) {
        ptr1++;
      }
      while (ptr2 < n && a[ptr2] - a[i] <= d) {
        ptr2++;
      }
      ans += ptr2 - ptr1 - 1;
    }
    cout << ans << '\n';
    return 0;
  }
}

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