이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
int sum[7500005],v[7500005];
long long x,i,d,m,ceau,tip,n;
int main()
{
#ifdef HOME
ifstream cin("date.in");
ofstream cout("date.out");
#endif // HOME
cin>>tip;
if (tip==1)
{
cin>>n>>d>>m;
for (i=1;i<=n;i++)
{
cin>>x;
v[x]++;
}
for (i=1;i<=m;i++)
{
sum[i]=sum[i-1]+v[i];
ceau=ceau+1LL*(sum[i-1]-sum[i-d-1])*v[i]+(1LL*v[i]*(v[i]-1))/2;
}
cout<<ceau;
}
return 0;
}
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