Submission #850876

#	Time	Username	Problem	Language	Result	Execution time	Memory
850876		tvladm2009	A Huge Tower (CEOI10_tower)	C++17	0 / 100	1 ms	548 KiB

tower

#include <bits/stdc++.h>

using namespace std;

bool home = 1;

typedef long long ll;

const int M = (int) 1e9 + 9;
int n;
int d;

int mul(int a, int b) {
  return a * (ll)b % M;
}

int main() {
  if (!home) {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  } else {
    freopen ("input", "r", stdin);
  }

  cin >> n >> d;
  vector<int> v;
  for (int i = 1; i <= n; i++) {
    int x;
    cin >> x;
    v.push_back(x);
  }
  sort(v.begin(), v.end());
  int j = (int) v.size() - 1;
  int ret = 1;
  for (int i = (int) v.size() - 2; i >= 0; i--) {
    while (v[i] + d < v[j]) {
      j--;
    }
    ret = mul(ret, j - i + 1);
  }
  cout << ret << "\n";
  return 0;
}

Compilation message (stderr)

tower.cpp: In function 'int main()':
tower.cpp:21:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     freopen ("input", "r", stdin);
      |     ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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