#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 1;
unordered_map<int, vector<int>> v[4 * N];
set<int> A, B;
int h[N], n, U;
// void build(int x, int tl, int tr) {
// if (tl == tr) {
// return;
// }
// int tm = (tl + tr) / 2;
// build(2 * x, tl, tm);
// build(2 * x + 1, tm + 1, tr);
// }
void add(int x, int tl, int tr, int l, int r, int a, int b) {
if (r < tl || l > tr)
return;
if (l <= tl && r >= tr) {
v[x][a].push_back(b);
v[x][b].push_back(a);
return;
}
int tm = (tl + tr) / 2;
add(2 * x, tl, tm, l, r, a, b);
add(2 * x + 1, tm + 1, tr, l, r, a, b);
}
void go(int x, int tl, int tr, int T, int a, int b) {
for (auto i : v[x][a]) {
A.insert(h[i]);
}
for (auto i : v[x][b]) {
B.insert(h[i]);
}
if (tl == tr) {
return;
}
int tm = (tl + tr) / 2;
if (T <= tm)
go(2 * x, tl, tm, T, a, b);
else
go(2 * x + 1, tm + 1, tr, T, a, b);
}
void init(int N, int D, int H[]) {
n = N;
for (int i = 0; i < N; i++) {
h[i] = H[i];
}
}
void curseChanges(int U, int A[], int B[]) {
map<pair<int, int>, int> open;
::U = U;
// build(1, 0, U);
for (int i = 0; i < U; i++) {
if (A[i] > B[i])
swap(A[i], B[i]);
if (open[{A[i], B[i]}]) {
add(1, 0, U, open[{A[i], B[i]}], i, A[i], B[i]);
open[{A[i], B[i]}] = 0;
} else {
open[{A[i], B[i]}] = i + 1;
}
}
for (auto i : open) {
if (i.second) {
add(1, 0, U, i.second, U, i.first.first, i.first.second);
}
}
}
int question(int x, int y, int v) {
int res = 1e9;
go(1, 0, U, v, x, y);
if (A.empty() || B.empty()) {
return res;
}
// cou t << "X: " << s[x].size() << " Y: " << s[y].size() << " V: " << v << "\n";
for (auto i : A) {
auto r = B.lower_bound(i);
if (r != B.end()) {
res = min(res, abs(i - *r));
}
if (r != B.begin()) {
r--;
res = min(res, abs(i - *r));
}
}
A.clear();
B.clear();
return res;
}
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