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>
using namespace std;
#define endl '\n'
typedef long long ll;
int main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int L,R; cin >> L >> R;
    vector<int> LL;
    vector<int> RR;
    for(int i = 1; i <= L; i++) {
        int x; cin >> x;
        LL.push_back(x);
    }
    for(int i = 1; i <= R; i++) {
        int x; cin >> x;
        RR.push_back(x);
    }
    sort(LL.begin(),LL.end());
    sort(RR.begin(),RR.end());
    int Max = INT_MIN;
    if(L > R) {
        int leftptr = 0;
        for(int i = 0; i < R; i++) {
            while(abs(RR[i] - LL[leftptr]) > abs(RR[i] - LL[leftptr + 1])) leftptr++;
            Max = max(Max,abs(RR[i] - LL[leftptr]));
        }
    }
    else if(R > L) {
        int leftptr = 0;
        for(int i = 0; i < L; i++) {
            while(abs(LL[i] - RR[leftptr]) > abs(LL[i] - RR[leftptr + 1])) leftptr++;
            Max = max(Max,abs(LL[i] - RR[leftptr]));
        }
    }
    else {
        for(int i = 0; i < L; i++) {
            Max = max(Max,abs(LL[i] - RR[i]));
        }
    }
    cout << Max;
    return 0;
}
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