#include<bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;
const int C = 50;
int n, d, u;
vector<int> h, a, b;
vector<vector<vector<int>>> lis;
vector<vector<int>> lday;
vector<vector<int>> op;
vector<bool> cnt;
void chmin(int &a, int b) {
if (a > b) a = b;
}
void init(int N, int D, int H[]) {
n = N; d = D;
h.resize(N);
rep(i, N) h[i] = H[i];
}
void curseChanges(int U, int A[], int B[]) {
u = U;
a.resize(U); b.resize(U);
rep(i, U) {
a[i] = A[i]; b[i] = B[i];
if (a[i] > b[i]) swap(a[i], b[i]);
}
lis.assign(n, {{}}); lday.resize(n, {0}); op.resize(n); cnt.resize(U+1);
set<pair<int, int>> se;
rep(i, U) {
op[a[i]].push_back(i+1); op[b[i]].push_back(i+1);
if (op[a[i]].size() % C == 1) {
lis[a[i]].push_back(lis[a[i]].back());
lday[a[i]].push_back(i+1);
}
if (op[b[i]].size() % C == 1) {
lday[b[i]].push_back(i+1); lis[b[i]].push_back(lis[b[i]].back());
}
cnt[i+1] = se.count({a[i], b[i]});
if (se.count({a[i], b[i]})) {
se.erase({a[i], b[i]});
lis[a[i]].back().erase(find(lis[a[i]].back().begin(), lis[a[i]].back().end(), h[b[i]]));
lis[b[i]].back().erase(find(lis[b[i]].back().begin(), lis[b[i]].back().end(), h[a[i]]));
}
else {
se.insert({a[i], b[i]});
lis[a[i]].back().push_back(h[b[i]]); lis[b[i]].back().push_back(h[a[i]]);
}
lday[a[i]].back() = i + 1; lday[b[i]].back() = i + 1;
}
}
int question(int x, int y, int v) {
int idx = distance(lday[x].begin(), upper_bound(lday[x].begin(), lday[x].end(), v))-1;
int idy = distance(lday[y].begin(), upper_bound(lday[y].begin(), lday[y].end(), v))-1;
auto vx = lis[x][idx], vy = lis[y][idy];
auto it = upper_bound(op[x].begin(), op[x].end(), lday[x][idx]);
while (it != op[x].end() && *it <= v) {
if (cnt[*it]) vx.erase(find(vx.begin(), vx.end(), h[a[*it-1]+b[*it-1]-x]));
else vx.push_back(h[a[*it-1]+b[*it-1]-x]);
it++;
}
it = upper_bound(op[y].begin(), op[y].end(), lday[y][idy]);
while (it != op[y].end() && *it <= v) {
if (cnt[*it]) vy.erase(find(vy.begin(), vy.end(), h[a[*it-1]+b[*it-1]-y]));
else vy.push_back(h[a[*it-1]+b[*it-1]-y]);
it++;
}
sort(vx.begin(), vx.end());
sort(vy.begin(), vy.end());
int res = 1e9;
int i = 0, j = 0;
while (i < vx.size() && j < vy.size()) {
chmin(res, abs(vx[i] - vy[j]));
if (vx[i] <= vy[j]) i++;
else j++;
}
return res;
}
