This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0);cin.tie(NULL);cout.tie(NULL)
#define ll long long int
#define ld long double
using namespace std;
const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
void solve(){
long long b, n, d, m;
cin >> b >> n >> d >> m;
long long ans = 0;
if(b == 1){
long long a[n];
for(int i = 0; i < n; ++i)
cin >> a[i];
sort(a, a + n);
for(int i = 0; i < n; ++i){
int low = i + 1, ok = -1, high = n - 1;
while(low <= high){
int mid = (low + high) / 2;
if(a[mid] - a[i] <= d){
ok = mid;
low = mid + 1;
}
else
high = mid - 1;
}
if(ok != -1)
ans += (ok - i);
}
cout << ans << '\n';
}
else if(b == 2){
pair<long long, long long> a[n];
for(int i = 0; i < n; ++i)
cin >> a[i].first >> a[i].second;
for(int i = 0; i < n; ++i){
for(int j = i + 1; j < n; ++j){
long long dis = abs(a[i].first - a[j].first);
dis += abs(a[i].second - a[j].second);
ans += (dis <= d);
}
}
cout << ans << '\n';
}
}
int main(){
fast;
int t = 1;
// cin >> t;
while(t--)
solve();
return 0;
}
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