求大佬看看怎么改，2、3题TLE。第8题WA，不会用map。

#include<stdio.h>
#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(void){
	int n,c;
	int i;
	int count=0;
	long long a[200009];
	scanf("%d%d",&n,&c);
	for(i = 0;i<n;i++){
		scanf("%lld",&a[i]);
	} 
	sort(a,a+n);
	for(i = 0;i<n-2;i++){
		int l = i+1,r = n+1;
		while(l<r){
			int mid = (l+r)>>1;
			if(a[mid] < a[i] + c){
				l = mid + 1; 
			}else{
				r = mid;
			} 
		}
		for(int j = 0;;j++){
			if(a[r+j] == a[i] + c){
			count++;
			}else{
				break;
			}
		}
	}
	if(a[n-1]-a[n-2] == c){
		count++;
	}
	printf("%d",count);
	return 0;
}