| # | Time | Username | Problem | Language | Result | Execution time | Memory |
|---|---|---|---|---|---|---|---|
| 1323507 | chithanhnguyen | Bubble Sort 2 (JOI18_bubblesort2) | C++20 | 0 ms | 0 KiB |
/*
Author: Nguyen Chi Thanh - High School for the Gifted - VNU.HCM (i2528)
*/
#ifndef NCTHANH
#include "bubblesort2.h"
#endif
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ull unsigned long long
#define ld long double
#define pii pair<int, int>
#define fi first
#define se second
#define __builtin_popcount __builtin_popcountll
#define all(x) (x).begin(), (x).end()
#define BIT(x, i) (((x) >> (i)) & 1)
#define MASK(x) ((1ll << (x)))
#define debug(a, l, r) for (int _i = (l); _i <= (r); ++_i) cout << (a)[_i] << ' '; cout << '\n';
struct Normalize {
vector<int> vals;
void add(int v) {vals.push_back(v);}
void build() {
sort(all(vals));
vals.erase(unique(all(vals)), end(vals));
}
int compress(int v) {
return (int)(lower_bound(all(vals), v) - begin(vals)) + 1;
}
};
struct FenwickTree {
int n;
vector<int> fen;
FenwickTree(int _n) : n(_n), fen(n + 5, 0) {}
void reset() {fill(all(fen), 0);}
void update(int idx, int v) {
for (int i = idx; i <= n; i += i & -i)
fen[i] += v;
}
int get(int idx) {
int sum = 0;
for (int i = idx; i; i -= i & -i)
sum += fen[i];
return sum;
}
};
vector<int> countScans(vector<int> a, vector<int> x, vector<int> v) {
int n = (int)a.size(), q = (int)x.size();
// Compressing the values
Normalize norm;
{
for (auto val : a) norm.add(val);
for (auto val : v) norm.add(val);
norm.build();
for (int i = 0; i < n; ++i) a[i] = norm.compress(a[i]);
for (int i = 0; i < q; ++i) v[i] = norm.compress(v[i]);
}
vector<int> res(q, 0);
int sz = (int)norm.vals.size() + 5;
FenwickTree fen(sz);
for (int i = 0; i < q; ++i) {
fen.reset();
a[x[i]] = v[i];
int ans = 0;
for (int j = 0; j < n; ++j) {
int contrib = fen.get(sz) - fen.get(a[j]);
fen.update(a[j], 1);
ans = max(ans, contrib);
}
res[i] = ans;
}
return res;
}
#ifdef NCTHANH
signed main() {
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
ios_base::sync_with_stdio(0);
cin.tie(nullptr); cout.tie(nullptr);
int n, q; cin >> n >> q;
vector<int> a(n), x(q), v(q);
for (int i = 0; i < n; ++i) cin >> a[i];
for (int i = 0; i < q; ++i)
cin >> x[i] >> v[i];
vector<int> res = countScans(a, x, v);
for (int i = 0; i < q; ++i) cout << res[i] << '\n';
return 0;
}
#endif