This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#pragma GCC optimize("unroll-loops,Ofast,O3")
#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define spc << " " <<
#define endl "\n"
#define all(x) x.begin(), x.end()
#define ll long long
#define int long long
#define ii pair<int,int>
#define vi vector<int>
#define vii vector<ii>
#define st first
#define nd second
#define inf 1000000009
#define MOD 1000000007
#define lim 200005
using namespace std;
void solve(){
int n,m; cin >> n >> m;
if(n==m){
int arr[n+1], brr[n+1];
for(int i=1; i<=n; i++) cin >> arr[i];
for(int i=1; i<=n; i++) cin >> brr[i];
sort(arr+1, arr+n+1);
sort(brr+1, brr+n+1);
int ans=0;
for(int i=1; i<=n; i++) ans = max(ans, abs(arr[i]-brr[i]));
cout << ans << endl;
}
}
signed main(){
ios_base::sync_with_stdio(false);cin.tie(0);
#ifdef Local
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
ll t=1;
//cin >> t;
while(t--) solve();
}
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