Submission #983469

#	Time	Username	Problem	Language	Result	Execution time	Memory
983469		coolsentenceidontremember	A Huge Tower (CEOI10_tower)	C++17	100 / 100	94 ms	8788 KiB

tower

#include<bits/stdc++.h>

#pragma GCC optimize("O3", "unroll-loops")


#define ll long long
#define ld long double
#define ff first
#define ss second
#define db double
#define time_begin() auto begin = chrono::high_resolution_clock::now()
#define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds";
#define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother"

using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}

const int MOD = 1e9 + 9;

int main(){
	setIO();
    int n, d;
    cin >> n >> d;
    int a[n];
    for (int &i : a) cin >> i;
    sort(a, a+n);
    int r = 0;
    ll ans = 1;
    for (int l = 0; l < n; l++){
    	while (r < n-1 && a[r+1] - a[l] <= d) r++;
    	ans = (1LL*ans*(r-l+1))%MOD;
	}
	cout << ans;
}

Compilation message (stderr)

tower.cpp: In function 'void setIO(std::string)':
tower.cpp:22:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:23:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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