Submission #362765

#	Time	Username	Problem	Language	Result	Execution time	Memory
362765		Sparky_09	A Huge Tower (CEOI10_tower)	C++17	30 / 100	132 ms	9980 KiB

tower

#include "bits/stdc++.h"
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define trav(a, x) for(auto& a : x)
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<ll, ll> pii;
typedef vector<ll> vi;
typedef vector<pii> vpi;

void usaco(string s){
  freopen((s+".in").c_str(), "r", stdin);
  freopen((s+".out").c_str(), "w", stdout);
}

int main() {
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);
#ifdef LOCAL_DEFINE
	freopen("input.txt", "r", stdin);
#endif
  ll n, d;
  cin >> n >> d;
  vector<ll> a(n);
  for(ll i = 0; i < n; i++){
    cin >> a[i];
  }
  sort(a.begin(), a.end());
  vector<ll> ans(n, 0);
  ll poin = 0;
  for(ll i = 0; i < n; i++){
    while(poin < i and a[poin] + d < a[i]){
      poin++;
    }
    ans[i] = i - poin;
  }
  ll fans = 1;
  const ll MOD = 1e9;
  for(ll i = 1; i < n; i++){
    fans = 1LL * fans * (ans[i] + 1) % MOD;
  }
  cout << fans << '\n';
}

Compilation message (stderr)

tower.cpp: In function 'void usaco(std::string)':
tower.cpp:13:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   13 |   freopen((s+".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:14:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |   freopen((s+".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
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