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;
const int MN = 1e5+5;
int B,N,D,M,X[MN],cnt;
long long ans;
int main()
{
cin >> B >> N >> D >> M;
for(int i=0; i<N; i++) cin >> X[i];
sort(X,X+N);
for(int i=0; i<N; i++){
while(cnt<N && X[i]+D>=X[cnt]) cnt++;
ans += cnt-i-1;
}
cout << ans;
}
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