#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9, C = 20;
int H[100000];
struct cmp { bool operator()(int a, int b) const { return tie(H[a], a) < tie(H[b], b); } };
map<int, set<int, cmp>> trust[100000];
map<int, vector<pair<int, int>>> updates[100000];
void init(int N, int D, int H[]) {
for (int i = 0; i < N; i++) {
trust[i][0] = set<int, cmp>();
updates[i][0] = {};
::H[i] = H[i];
}
}
set<int, cmp> playback(int shaman, int time) {
set<int, cmp> s = prev(trust[shaman].upper_bound(time))->second;
vector<pair<int, int>> u = prev(updates[shaman].upper_bound(time))->second;
for (pair<int, int> i : u) {
if (i.first >= time) break;
if (s.find(i.second) == s.end()) s.insert(i.second);
else s.erase(i.second);
}
return s;
}
void curseChanges(int U, int A[], int B[]) {
for (int i = 0; i < U; i++) {
updates[A[i]].rbegin()->second.push_back({i, B[i]});
updates[B[i]].rbegin()->second.push_back({i, A[i]});
if (updates[A[i]].rbegin()->second.size() == C) {
trust[A[i]][i + 1] = playback(A[i], i + 1);
updates[A[i]][i + 1] = {};
}
if (updates[B[i]].rbegin()->second.size() == C) {
trust[B[i]][i + 1] = playback(B[i], i + 1);
updates[B[i]][i + 1] = {};
}
}
}
int question(int x, int y, int v) {
set<int, cmp> sx = playback(x, v);
set<int, cmp> sy = playback(y, v);
int ans = INF;
for (auto xptr = sx.begin(), yptr = sy.begin(); xptr != sx.end() && yptr != sy.end(); xptr++) {
while (next(yptr) != sy.end() && H[*next(yptr)] < H[*xptr]) yptr++;
ans = min(ans, abs(H[*xptr] - H[*yptr]));
if (next(yptr) != sy.end()) ans = min(ans, abs(H[*xptr] - H[*next(yptr)]));
}
return ans;
}
