#include "bits/stdc++.h"
using namespace std;
#ifdef Nero
#include "Deb.h"
#else
#define debug(...)
#endif
const int N = 1e6 + 6;
int tree[N];
int seg[N * 2];
int lazy[N * 2];
set<int> occ[N];
void push(int nd, int l, int r) {
if (!lazy[nd]) {
return;
}
seg[nd] += lazy[nd];
if (l != r) {
int mid = (l + r) >> 1;
int rs = nd + ((mid - l + 1) << 1);
lazy[nd + 1] += lazy[nd];
lazy[rs] += lazy[nd];
}
lazy[nd] = 0;
}
void upd(int nd, int l, int r, int s, int e, int v) {
push(nd, l, r);
if (l >= s && r <= e) {
lazy[nd] = v;
push(nd, l, r);
return;
}
int mid = (l + r) >> 1;
int rs = nd + ((mid - l + 1) << 1);
if (mid >= e) {
upd(nd + 1, l, mid, s, e, v);
push(rs, mid + 1, r);
} else {
if (mid < s) {
push(nd + 1, l, mid);
upd(rs, mid + 1, r, s, e, v);
} else {
upd(nd + 1, l, mid, s, e, v);
upd(rs, mid + 1, r, s, e, v);
}
}
seg[nd] = max(seg[nd + 1], seg[rs]);
}
void upd(int nd, int l, int r, int p, int v) {
if (l == r) {
seg[nd] = v;
return;
}
int mid = (l + r) >> 1;
int rs = nd + ((mid - l + 1) << 1);
if (p <= mid) {
upd(nd + 1, l, mid, p, v);
} else {
upd(rs, mid + 1, r, p, v);
}
seg[nd] = max(seg[nd + 1], seg[rs]);
}
void upd(int id, int v) {
id++;
while (id < N) {
tree[id] += v;
id += id & -id;
}
}
int qry(int id) {
id++;
int ret = 0;
while (id > 0) {
ret += tree[id];
id -= id & -id;
}
return ret;
}
vector<int> countScans(vector<int> a, vector<int> x, vector<int> v) {
int n = (int) a.size();
int q = (int) x.size();
map<int, int> mp;
for (int i = 0; i < n; ++i) {
mp[a[i]];
}
for (int i = 0; i < q; ++i) {
mp[v[i]];
}
int cnt = 0;
for (auto& [val, cval] : mp) {
cval = cnt++;
}
for (int i = 0; i < n; ++i) {
a[i] = mp[a[i]];
}
for (int i = 0; i < q; ++i) {
v[i] = mp[v[i]];
}
for (int i = 0; i < n; ++i) {
occ[a[i]].insert(i);
upd(a[i], 1);
}
for (int i = 0; i < n; ++i) {
int lst = *occ[a[i]].rbegin();
if (i == lst) {
int smaller = qry(a[i]);
upd(0, 0, cnt, a[i], lst + 1 - smaller);
}
}
vector<int> ret(q);
for (int i = 0; i < q; ++i) {
upd(a[x[i]], -1);
upd(0, 0, cnt, a[x[i]], cnt - 1, 1);
upd(v[i], 1);
upd(0, 0, cnt, v[i], cnt - 1, -1);
occ[a[x[i]]].erase(x[i]);
if (!occ[a[x[i]]].empty()) {
int smaller = qry(a[x[i]]);
int lst = *occ[a[x[i]]].rbegin();
upd(0, 0, cnt, a[x[i]], lst + 1 - smaller);
}
occ[v[i]].insert(x[i]);
int smaller = qry(v[i]);
int lst = *occ[v[i]].rbegin();
upd(0, 0, cnt, v[i], lst + 1 - smaller);
a[x[i]] = v[i];
ret[i] = seg[0];
}
return ret;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, q;
cin >> n >> q;
vector<int> a(n);
for (int i = 0; i < n; ++i) {
cin >> a[i];
}
vector<int> x(q), v(q);
for (int i = 0; i < q; ++i) {
cin >> x[i] >> v[i];
}
vector<int> answers = countScans(a, x, v);
for (int i : answers) {
cout << i << '\n';
}
return 0;
}
Compilation message
/usr/bin/ld: /tmp/cc7GHEWD.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccIrh4EB.o:bubblesort2.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
