Submission #371414

#	Time	Username	Problem	Language	Result	Execution time	Memory
371414		eulerdesoja	A Huge Tower (CEOI10_tower)	C++17	100 / 100	167 ms	8848 KiB

tower

#include<bits/stdc++.h>
#include<fstream>
using namespace std;

#define ll long long
#define pb push_back
#define sz(x) int(x.size())

typedef pair<int,int>ii;
typedef vector<int> vi;

void setIO(string s) {
  ios_base::sync_with_stdio(0); cin.tie(0); 
  freopen((s+".in").c_str(),"r",stdin);
  freopen((s+".out").c_str(),"w",stdout);
}
const ll mod=1e9+9;
int32_t main(){
	ios_base::sync_with_stdio(0);cin.tie(0);
	//setIO("sort");
	int n,d;cin>>n>>d;
	vi a(n);
	for(int i=0;i<n;i++)cin>>a[i];
	sort(a.begin(),a.end())	;
	int r=0;
	ll ans=1;
	for(int l=0;l<n;l++){
		while(r+1<n && a[r+1]-a[l]<=d)r++;
		ans=(ans*1ll*(r-l+1))%mod;
	}
	cout<<ans<<"\n";

	return 0;
}

Compilation message (stderr)

tower.cpp: In function 'void setIO(std::string)':
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+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tower.cpp:15:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 20: 5 / 5