#include <bits/stdc++.h>
using namespace std;
#define sz size()
const int N=(int)1e5+3;
int h[N],a[N],b[N];
int cnt[N],cnt1[N];
int n,d;
int m;
void init(int N, int D, int H[]) {
n=N;
d=D;
for(int i=0;i<N;i++)h[i]=H[i];
}
void curseChanges(int U, int A[], int B[]) {
m=U;
for(int i=0;i<m;i++)a[i]=A[i],b[i]=B[i];
}
int question(int x, int y, int v) {
// cerr<<x<<" "<<y<<" "<<v<<"\n";
for(int i=0;i<v;i++){
if(a[i]==x)cnt[b[i]]^=1;
else if(b[i]==x)cnt[a[i]]^=1;
if(a[i]==y)cnt1[b[i]]^=1;
else if(b[i]==y)cnt1[a[i]]^=1;
}
vector<int>vec,vec1;
for(int i=0;i<v;i++){
if(cnt[a[i]]==1){
vec.push_back(h[a[i]]);
cnt[a[i]]=0;
}
if(cnt[b[i]]==1){
vec.push_back(h[b[i]]);
cnt[b[i]]=0;
}
if(cnt1[a[i]]==1){
vec1.push_back(h[a[i]]);
cnt1[a[i]]=0;
}
if(cnt1[b[i]]==1){
vec1.push_back(h[b[i]]);
cnt1[b[i]]=0;
}
}
if(vec.empty()||vec1.empty())return (int)1e9;
sort(vec.begin(),vec.end());
sort(vec1.begin(),vec1.end());
// for(auto to:vec1)cout<<to<<" ";
// cout<<"\n";
// for(auto to:vec)cout<<to<<" ";
// cout<<"\n";
int mn=(int)1e9;
int j=0;
for(auto to:vec){
while(j<(int)vec1.sz-1&&vec1[j]<to)j++;
mn=min(mn,abs(vec1[j]-to));
if(j>0)mn=min(mn,abs(to-vec1[j-1]));
}
return mn;
}
// int main() {
// int N, D, U, Q;
// std::ios::sync_with_stdio(false); std::cin.tie(NULL);
// std::cin >> N >> D >> U >> Q;
//
// int *F = new int[N];
// for (int i=0; i<N; i++)
// std::cin >> F[i];
// init(N, D, F);
//
// int *A = new int[U], *B = new int[U];
// for (int i=0; i<U; i++) {
// std::cin >> A[i] >> B[i];
// }
// curseChanges(U, A, B);
//
// bool correct = true;
// for (int i=0; i<Q; i++) {
// int X,Y,V,CorrectAnswer;
// std::cin >> X >> Y >> V >> CorrectAnswer;
// int YourAnswer = question(X,Y,V);
// if (YourAnswer != CorrectAnswer) {
// std::cout << "WA! Question: " << i
// << " (X=" << X << ", Y=" << Y << ", V=" << V << ") "
// << "Your answer: " << YourAnswer
// << " Correct Answer: " << CorrectAnswer << std::endl;
// correct = false;
// } else {
// std::cerr << YourAnswer << " - OK" << std::endl;
// }
// }
//
// if (correct) {
// std::cout << "Correct." << std::endl;
// } else std::cout << "Incorrect." << std::endl;
// return 0;
// }
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