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;
long long f1(vector<int> &mas, int X){ // N log N
// mas isrikiuotas
long long ret = 0;
for(auto x : mas){
// cout << x << " prd " << upper_bound(mas.begin(), mas.end(), x + X) - lower_bound(mas.begin(), mas.end(), x - X) << endl;
ret += upper_bound(mas.begin(), mas.end(), x + X) - lower_bound(mas.begin(), mas.end(), x - X)-1;
}
return ret;
}
int main(){
int B, n, d, m; cin >> B >> n >> d >> m;
if(B == 1){
vector<int> ms(n); for(auto &x : ms) cin >> x;
sort(ms.begin(), ms.end());
cout << f1(ms, d) /2ll;
return 0;
}
return 0;
}
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