Submission #391236

#	Time	Username	Problem	Language	Result	Execution time	Memory
391236		Return_0	Bubble Sort 2 (JOI18_bubblesort2)	C++17	100 / 100	3403 ms	128884 KiB

bubblesort2

#pragma GCC optimize("Ofast,unroll-loops")
// #pragma comment(linker, "/stack:200000000")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma,tune=native")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#ifndef SINA
#include "bubblesort2.h"
#endif

using namespace std;
using namespace __gnu_pbds;

typedef int ll;
typedef long double ld;
typedef pair <ll, ll> pll;

#ifdef SINA
#define dbg(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1> void __f(const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << std::endl; }
template <typename Arg1, typename... Args> void __f (const char* names, Arg1&& arg1, Args&&... args) {
	const char* comma = strchr(names + 1, ',');cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...); }
#define dbg2(x, j, n) cout<< #x << " : "; output((j), (n), x, 1); cout.flush();
#else
#define dbg(...) 0
#define dbg2(x, j, n) 0
#endif
#define SZ(x) ((ll)((x).size()))
#define File(s, t) freopen(s ".txt", "r", stdin); freopen(t ".txt", "w", stdout);
#define input(j, n, a) for (int _i = (j); _i < (n)+(j); _i++) cin>> a[_i];
#define output(j, n, a, t) for (int _i = (j); _i < (n)+(j); _i++) cout<< a[_i] << (((t) && _i != (n)+(j)-1)? ' ' : '\n');
#define kill(x) return cout<< (x) << endl, 0
#define cl const ll
#define fr first
#define sc second
#define lc (v << 1)
#define rc (lc | 1)
#define mid ((l + r) >> 1)
#define All(x) (x).begin(), (x).end()

cl inf = sizeof(ll) == 4 ? (1e9 + 10) : (3e18), mod = 1e9 + 7, MOD = 998244353;

template <class A,class B> ostream& operator << (ostream& out,const pair<A,B>&a){return out<<'('<<a.first<<", "<<a.second<<')';}
template <class A> ostream& operator << (ostream& out, const vector<A> &a) {
	out<< '['; for (int i = -1; ++i < int(a.size());) out<< a[i] << (i + 1 < int(a.size()) ? ", " : ""); return out<<']'; }
template <class T, typename _t = less <T> > using Tree = tree <T, null_type, _t, rb_tree_tag, tree_order_statistics_node_update>;

cl N = 5e5 + 7;

struct segtree {
	ll l, r, mx, lz;
	segtree *lt, *rt;
	inline segtree (cl &L = 1, cl &R = N - 2) : l(L), r(R), mx(0), lz(0) {}

	void build () {
		mx = -inf;
		if (l == r) return;
		lt = new segtree (l, mid);
		rt = new segtree (mid + 1, r);
		lt->build();
		rt->build();
	}

	inline void push (cl &x) { mx += x; lz += x; }
	inline void shift () { lt->push(lz); rt->push(lz); lz = 0; }

	void upd (cl &ql, cl &qr, cl &x) {
		if (r < ql || qr < l)   return;
		if (ql <= l && r <= qr) {
			push(x);
			return;
		}
		shift();
		lt->upd(ql, qr, x);
		rt->upd(ql, qr, x);
		mx = max(lt->mx, rt->mx);
	}

	ll ask (cl &ql, cl &qr) {
		if (r < ql || qr < l)   return -inf;
		if (ql <= l && r <= qr) return mx;
		shift();
		return max(lt->ask(ql, qr), rt->ask(ql, qr));
	}
} seg;

vector <ll> countScans (vector <ll> a, vector <ll> x, vector <ll> v) {
	ll n = SZ(a), q = SZ(x);
	vector <pll> cmprs;
	for (ll i = 0; i < n; i++) cmprs.push_back({a[i], i});
	for (ll i = 0; i < q; i++) cmprs.push_back({v[i], x[i]});
	sort(All(cmprs)); cmprs.resize(unique(All(cmprs)) - cmprs.begin());
	seg.r = SZ(cmprs); seg.build();
	const auto fun = [&](cl &val, cl &pos, cl &z) {
		ll P = lower_bound(All(cmprs), pll(val, pos)) - cmprs.begin() + 1;
		seg.upd(P, P, z * (inf + pos));
		seg.upd(P + 1, seg.r, z * -1);
	};
	for (ll i = 0; i < n; i++) fun(a[i], i, 1);
	vector <ll> ans (q);
	for (ll i = 0, p1, p2; i < q; i++) {
		fun(a[x[i]], x[i], -1);
		a[x[i]] = v[i];
		fun(v[i], x[i], 1);
		ans[i] = seg.mx;
	}
	return ans;
}

#ifdef SINA
int main ()
{
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	cout<< countScans({1, 2, 3, 4}, {0, 2}, {3, 1}) << endl;

	cerr<< "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n";

	return 0;
}
#endif
/*

*/

Compilation message (stderr)

bubblesort2.cpp: In function 'std::vector<int> countScans(std::vector<int>, std::vector<int>, std::vector<int>)':
bubblesort2.cpp:103:17: warning: unused variable 'p1' [-Wunused-variable]
  103 |  for (ll i = 0, p1, p2; i < q; i++) {
      |                 ^~
bubblesort2.cpp:103:21: warning: unused variable 'p2' [-Wunused-variable]
  103 |  for (ll i = 0, p1, p2; i < q; i++) {
      |                     ^~

• Subtask 1: 17 / 17
• Subtask 2: 21 / 21
• Subtask 3: 22 / 22
• Subtask 4: 40 / 40