瞎写的

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
const ll szc = 2e5+10;
ll sz[szc];


int main()
{
    ll n;
    cin >> n;
    for(ll i = 0;i < n;i++)cin >> sz[i];
    ll b = sz[0],s = sz[0];
    for(ll i = 0;i < n;i++){
        b = b < sz[i]?sz[i]:b;
        s = s > sz[i]?sz[i]:s;
    }
    cout << b-s;
    return 0;
}