#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define F first
#define S second
using namespace std;
int N, D, H[100005], U, B, uid[200005], udx;
pii change[200005];
bool block[505][200005];
vector<int> v[100005];
map<int, int> mp[100005];
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[])
{
U = u;
B = sqrt(U);
for (int i = 0; i < U; i++)
{
if (a[i] > b[i])
swap(a[i], b[i]);
change[i].F = a[i];
change[i].S = b[i];
}
for (int i = 0; i < U; i++)
if (mp[a[i]][b[i]])
uid[i] = mp[a[i]][b[i]];
else
{
mp[a[i]][b[i]] = uid[i] = i;
v[a[i]].emplace_back(i);
v[b[i]].emplace_back(i);
}
for (int i = 1, j = 0; j < U; i++)
{
for (int k = 0; k < U; k++)
block[i][k] = block[i - 1][k];
for (; j < i * B && j < U; j++)
block[i][uid[j]] ^= 1;
}
}
int question(int x, int y, int V)
{
int b = V / B;
multiset<ll> sx, sy;
map<int, bool> mx, my;
for (int i : v[x])
if (block[b][i])
{
if (change[i].F == x)
{
sx.insert(H[change[i].S]);
mx[change[i].S] = 1;
}
else
{
sx.insert(H[change[i].F]);
mx[change[i].F] = 1;
}
}
for (int i : v[y])
if (block[b][i])
{
if (change[i].F == y)
{
sy.insert(H[change[i].S]);
my[change[i].S] = 1;
}
else
{
sy.insert(H[change[i].F]);
my[change[i].F] = 1;
}
}
for (int i = b * B; i < V; i++)
{
if (change[i].S == x)
{
if (mx[change[i].F])
{
mx[change[i].F] = 0;
sx.erase(sx.find(H[change[i].F]));
}
else
{
mx[change[i].F] = 1;
sx.insert(H[change[i].F]);
}
}
if (change[i].S == y)
{
if (my[change[i].F])
{
my[change[i].F] = 0;
sy.erase(sy.find(H[change[i].F]));
}
else
{
my[change[i].F] = 1;
sy.insert(H[change[i].F]);
}
}
if (change[i].F == x)
{
if (mx[change[i].S])
{
mx[change[i].S] = 0;
sx.erase(sx.find(H[change[i].S]));
}
else
{
mx[change[i].S] = 1;
sx.insert(H[change[i].S]);
}
}
if (change[i].F == y)
{
if (my[change[i].S])
{
my[change[i].S] = 0;
sy.erase(sy.find(H[change[i].S]));
}
else
{
my[change[i].S] = 1;
sy.insert(H[change[i].S]);
}
}
}
sy.insert(2e9);
sy.insert(-2e9);
ll ans = 1e9;
for (ll i : sx)
{
if (i <= -1.5e9 || i >= 1.5e9)
continue;
auto iter = sy.lower_bound(i);
ans = min({ans, abs(i - *iter), abs(i - *prev(iter))});
}
return ans;
}
/*
6 5 11 4
2 42 1000 54 68 234
0 1 2 0 3 4 3 5 3 5 1 3 5 3 0 5 3 0 1 3 3 5
0 3 4 26
3 0 8 0
0 5 5 1000000000
3 0 11 14
*/
