Language: C++

#include<bits/stdc++.h>
#define rg register
#define file(x) freopen(x".in","r",stdin);freopen(x".out","w",stdout);
using namespace std;
int read(){
    int x=0,f=1;char c=getchar();
    while(c<'0'||c>'9') f=(c=='-')?-1:1,c=getchar();
    while(c>='0'&&c<='9') x=x*10+c-48,c=getchar();
    return f*x;
}
struct node {
	int to,next;
}a[100011];
int head[100011],cnt,x[100010],bin[101];
int fa[100011][32],ans=0;
void add(int x,int y){
	a[++cnt].next=head[x];
	a[cnt].to=y;
	head[x]=cnt;#include<bits/stdc++.h>
#define rg register
#define file(x) freopen(x".in","r",stdin);freopen(x".out","w",stdout);
using namespace std;
int read(){
    int x=0,f=1;char c=getchar();
    while(c<'0'||c>'9') f=(c=='-')?-1:1,c=getchar();
    while(c>='0'&&c<='9') x=x*10+c-48,c=getchar();
    return f*x;
}
struct node {
	int to,next;
}a[100011];
int head[100011],cnt,x[100010],bin[101];
int fa[100011][32],ans=0;
void add(int x,int y){
	a[++cnt].next=head[x];
	a[cnt].to=y;
	head[x]=cnt;
}
void dfs(int x,int f){
	fa[x][0]=f;
	for(int i=1;i<=30;i++)
		fa[x][i]=fa[fa[x][i-1]][i-1];
	for(int i=head[x];i;i=a[i].next){
		int v=a[i].to;
		if(v==f) continue;
		dfs(v,x);
	}
}
int main(){
    //file("");
	int n=read(),y;
	for(int i=1;i<=n;i++)
		x[i]=read();
	bin[0]=1;
	for(int i=1;i<=30;i++)
		bin[i]=bin[i-1]*2;
	x[n+1]=2147483647;
	int L=read();
	for(int i=1;i<n;i++)
		y=lower_bound(x+1,x+2+n,L+x[i]+1)-x-1,add(y,i);
	dfs(n,0);
	int Q=read();
	while(Q--){
		int A=read(),B=read();
		if(A>B) swap(A,B);
		int ans=0;
		for(int i=30;i>=0;i--)
			if(fa[A][i]<=B&&fa[A][i])
				A=fa[A][i],ans+=bin[i];
		cout<<ans<<endl;
	}
    return 0;
}

}
void dfs(int x,int f){
	fa[x][0]=f;
	for(int i=1;i<=30;i++)
		fa[x][i]=fa[fa[x][i-1]][i-1];
	for(int i=head[x];i;i=a[i].next){
		int v=a[i].to;
		if(v==f) continue;
		dfs(v,x);
	}
}
int main(){
    //file("");
	int n=read(),y;
	for(int i=1;i<=n;i++)
		x[i]=read();
	bin[0]=1;
	for(int i=1;i<=30;i++)
		bin[i]=bin[i-1]*2;
	x[n+1]=2147483647;
	int L=read();
	for(int i=1;i<n;i++)
		y=lower_bound(x+1,x+2+n,L+x[i]+1)-x-1,add(y,i);
	dfs(n,0);
	int Q=read();
	while(Q--){
		int A=read(),B=read();
		if(A>B) swap(A,B);
		int ans=0;
		for(int i=30;i>=0;i--)
			if(fa[A][i]<=B&&fa[A][i])
				A=fa[A][i],ans+=bin[i];
		cout<<ans<<endl;
	}
    return 0;
}

Compiler output:
a.cc:19:21: error: stray '#' in program
   19 |         head[x]=cnt;#include<bits/stdc++.h>
      |                     ^
a.cc: In function 'void add(int, int)':
a.cc:19:22: error: 'include' was not declared in this scope
   19 |         head[x]=cnt;#include<bits/stdc++.h>
      |                      ^~~~~~~
a.cc:19:30: error: 'bits' was not declared in this scope
   19 |         head[x]=cnt;#include<bits/stdc++.h>
      |                              ^~~~
a.cc:19:35: error: 'stdc' was not declared in this scope; did you mean 'std'?
   19 |         head[x]=cnt;#include<bits/stdc++.h>
      |                                   ^~~~
      |                                   std
a.cc:22:1: error: expected primary-expression before 'using'
   22 | using namespace std;
      | ^~~~~
a.cc:23:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   23 | int read(){
      |         ^~
a.cc:23:9: note: remove parentheses to default-initialize a variable
   23 | int read(){
      |         ^~
      |         --
a.cc:23:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:23:11: error: a function-definition is not allowed here before '{' token
   23 | int read(){
      |           ^
a.cc:32:22: error: declaration of 'int x [100010]' shadows a parameter
   32 | int head[100011],cnt,x[100010],bin[101];
      |                      ^
a.cc:16:14: note: 'int x' previously declared here
   16 | void add(int x,int y){
      |          ~~~~^
a.cc:34:22: error: a function-definition is not allowed here before '{' token
   34 | void add(int x,int y){
      |                      ^
a.cc:39:22: error: a function-definition is not allowed here before '{' token
   39 | void dfs(int x,int f){
      |                      ^
a.cc:49:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   49 | int main(){
      |         ^~
a.cc:49:9: note: remove parentheses to default-initialize a variable
   49 | int main(){
      |         ^~
      |         --
a.cc:49:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:49:11: error: a function-definition is not allowed here before '{' token
   49 | int main(){
      |           ^