二分版本

#include <bits/stdc++.h>
using  namespace std;
int a[15];
int main(){
    for(int i=1;i<=10;i++){
        cin>>a[i];
    }
    sort(a+1,a+11);
    int n;
    cin>>n;
    int height=n+30;
    int left=1,right=10;
    int ans=0;
    while(left<=right){
        int mid=(left+right)/2;
        if(a[mid]>height){
            right=mid-1;
        }else{
            ans=mid;
            left=mid+1;
        }
    }
    cout<<ans;
    return 0;
}