이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
/*
Problem: IOI 2007 Pairs
When: 2023-11-16 14:54:19
Author: Ning07
*/
#include<bits/stdc++.h>
using namespace std;
using i64=long long;
const int NN=2e5;
int N,B,M,D,a[NN];
void solve1(){
for(int i=0;i<N;i++){
std::cin>>a[i];
}
sort(a,a+N);
i64 ans=0;
for(int i=0;i<N;i++){
int lst=lower_bound(a,a+N,a[i]-D)-a;
ans+=i-lst;
}
cout<<ans<<'\n';
}
void solve2(){
}
void solve3(){
}
int main(){
ios::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
std::cin>>B>>N>>D>>M;
if(B==1) solve1();
else if(B==2) solve2();
else if(B==3) solve3();
}
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