Triagain

#include<stdio.h>
#include<algorithm>
using namespace std;
int main()
{
    int n;
    scanf("%d",&n);
    int arr[n];
    for(int i = 0 ; i < n ; i ++){
        scanf("%d",&arr[i]);
    }
    if(n < 3){
        printf("%d",n);
        return 0;
    }
    sort(arr,arr+n);

    int ans = 0;
    for(int i = 0 ; i < n - 1 ; i ++){
        int sum = arr[i] + arr[i+1];
        int l = i + 2 , r = n - 1;
        while(l <= r){
            int m = (l+r)/2;
            if(sum > arr[m]){
                if(m - i + 1 > ans)ans = m - i + 1;
                l = m + 1;
            }else{
                r = m - 1;
            }
        }
    }
    printf("%d",ans);
    return 0;
}