This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define num(a) a-'0'
#define charr(a) (a - 'A' + 1)
#define rep(i,a,b) for(int i=a;i<b;i++)
#define maxs(a,b) if(b>a)a=b
#define mins(a,b) if(b<a)a=b
#define bin1(a) __builtin_popcount(a)
#define debug(x) cerr<<"["<<#x<<":"<<x<<"] "
#define debug2(a,b) debug(a);debug(b)
#define debug3(a,b,c) debug2(a,b);debug(c)
#define de cerr
#define gcd(a,b) __gcd(a,b)
#define lcm(a,b) (((a)/(__gcd(a,b))) * b)
#define print(arr) for(auto it = arr.begin();it < arr.end();it ++){cout << *it << " ";}cout << ln;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define all(a) (a).begin(), (a).end()
#define vi vector<int>
#define v vector
#define p pair
#define pii p<int,int>
#define pb push_back
#define mk make_pair
#define f first
#define s second
#define ln "\n"
typedef long double ld;
typedef double d;
using namespace std;
using namespace __gnu_pbds;
ll modF=1e9+7;
/*OUTPUT
*/
void solve(){
int n,m;
cin >> n >> m;
vi a(n);
rep(i,0,n){
cin >> a[i];
}
vi b(m);
rep(i,0,m){
cin >> b[i];
}
sort(all(a));
sort(all(b));
int ans = 0;
for(int i = 0;i < min(n,m);i ++){
maxs(ans,abs(b[i] - a[i]));
}
cout << ans << ln;
}
int main(){
ios::sync_with_stdio(0);cin.tie(0);
int t = 1;
// cin >> t;
while(t --){
solve();
}
}
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