Submission #1103109

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103109		zephyrion	A Huge Tower (CEOI10_tower)	C++17	100 / 100	93 ms	6992 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define int long long

const int mxN=1e7,MOD=1e9+9;
 
int N,D,a[mxN],c[mxN],res=1;
 
signed main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	
	cin>>N>>D;
	for (int i=0; i<N; i++)
		cin>>a[i];
	sort(a,a+N);
	for (int l=0,r=0; l<N; l++)
		for (; r<N && a[r]-a[l]<=D; r++)
			res=res*(r-l+1)%MOD;
	cout<<res;
	
	return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
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• Subtask 15: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5