帮我解释一下这个代码并加个注释呗(●'◡'●)

#include<iostream>
using namespace std;
int l, n, a, i, mx, mn;
int main(){
    cin >> l;
    cin >> n;
    for(i = 1; i <= n; i++){
		cin >> a;
        if(a <= l / 2){
			mn = max(a, mn);
        	mx = max(mx, l - a + 1);
        }else{
			mn = max(l - a + 1, mn);
            mx = max(mx, a);
        }
    }
    cout << mn << " " << mx;
    return 0;
}

玄关