Submission #1294191

#	Time	Username	Problem	Language	Result	Execution time	Memory
1294191		avighna	Pairs (IOI07_pairs)	C++20	Compilation error	0 ms	0 KiB

pairs

#include <algorithm>
#include <iostream>

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;
  }
}

Compilation message (stderr)

pairs.cpp: In function 'int main()':
pairs.cpp:15:5: error: 'vector' was not declared in this scope
   15 |     vector<int> a(n);
      |     ^~~~~~
pairs.cpp:3:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
    2 | #include <iostream>
  +++ |+#include <vector>
    3 | 
pairs.cpp:15:12: error: expected primary-expression before 'int'
   15 |     vector<int> a(n);
      |            ^~~
pairs.cpp:16:19: error: 'a' was not declared in this scope
   16 |     for (int &i : a) {
      |                   ^
pairs.cpp:19:10: error: 'a' was not declared in this scope
   19 |     sort(a.begin(), a.end());
      |          ^