Submission #952693

#	Time	Username	Problem	Language	Result	Execution time	Memory
952693		doducanh	A Huge Tower (CEOI10_tower)	C++14	100 / 100	203 ms	11984 KiB

tower

#include <bits/stdc++.h>

using namespace std;
#define int long long
const int mod=1e9+9;
int a[1000005];
int n,k;
main()
{
    cin>>n>>k;
    for(int i=1;i<=n;i++)cin>>a[i];
    sort(a+1,a+n+1);
    int r=0;
    int sol=1;
    for(int i=1;i<=n;i++){
        while(r<n&&a[r+1]-a[i]<=k)r++;
        r=max(r,i);
        int dist=(r-i+1);
        sol=(1ll*sol*dist)%mod;
    }
    cout<<sol;
    return 0;
}

Compilation message (stderr)

tower.cpp:8:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main()
      | ^~~~

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