@[quning](/user/1064136) 能给个代码吗？
代码看不到 QAQ
by jiangchen1234 @ 2023-12-12 21:03:30
```
#include<bits/stdc++.h>
using namespace std;
long long N,C,a[1000000];
long long j=0,ans,t,y;
int main(){
cin>>N>>C;
for(int i=1;i<=N;i++)
cin>>a[i];
sort(a,a+N+1);
for(int i=1;i<=N;i++){
if(a[i]==a[i-1])
ans+=y,j--;
else{
y=0;
t=a[i]+C;
while(a[i+1+j]<=t){
if(a[i+1+j]==t){
y++;
}
j++;
}j--;
ans+=y;
}
}
cout<<ans;
}
```
by quning @ 2023-12-12 21:28:59
@[jiangchen1234](/user/872579)
by quning @ 2023-12-12 21:30:31
@[quning](/user/1064136)
```cpp
#include<bits/stdc++.h>
using namespace std;
long long N,C,a[1000000];
long long j=0,ans,t,y;
int main() {
cin>>N>>C;
for(int i=1; i<=N; i++)
cin>>a[i];
sort(a,a+N+1);
for(int i=1; i<=N; i++) {
if(a[i]==a[i-1]) {
ans+=y,j--;
cout<<"j:"<<j<<endl;
} else {
y=0;
t=a[i]+C;
while(a[i+1+j]<=t) {
if(a[i+1+j]==t) {
y++;
}
j++;
}
j--;
cout<<"i:"<<i<<" j:"<<j<<endl;
ans+=y;
}
}
cout<<ans;
}
```
by jiangchen1234 @ 2023-12-12 21:47:22
@[quning](/user/1064136) 越界了吧
by jiangchen1234 @ 2023-12-12 21:47:50
@[quning](/user/1064136) 要加 $j \le n$
```cpp
#include<bits/stdc++.h>
using namespace std;
long long N,C,a[1000000];
long long j=0,ans,t,y;
int main() {
cin>>N>>C;
for(int i=1; i<=N; i++)
cin>>a[i];
sort(a,a+N+1);
for(int i=1; i<=N; i++) {
if(a[i]==a[i-1]) {
ans+=y,j--;
} else {
y=0;
t=a[i]+C;
while(a[i+1+j]<=t) {
if(j > N) break;
if(a[i+1+j]==t) {
y++;
}
j++;
}
j--;
ans+=y;
}
}
cout<<ans;
}
```
by jiangchen1234 @ 2023-12-12 21:51:15
@[jiangchen1234](/user/872579) 谢谢
by quning @ 2023-12-14 19:59:07
@[quning](/user/1064136) 不用谢
by jiangchen1234 @ 2023-12-14 20:02:45