Submission #423233

#	Time	Username	Problem	Language	Result	Execution time	Memory
423233		arayi	Dancing Elephants (IOI11_elephants)	C++17	26 / 100	9044 ms	14676 KiB

elephants

#include "elephants.h"
#include <map>
#include <unordered_map>
#include <set>
#include <iostream>
using namespace std;

const int N = 2e5 + 30;
const int T = 80;
int n, l, fr, sc, ii;
int x[N];
unordered_map <int, int> mp, cl;
int nax[N], haj[N], a[N], b[N], x1[N];
set <int> fp;

void go(int x)
{
	int sm = 1, s = 0;
	int nx = x, v = x;
	while (s < T)
	{
		s++;
		if (x1[v] > x1[nx] + l) sm++, nx = v;
		if (x1[v] == sc) break;
		v = haj[v];
	}
	a[x] = sm;
	b[x] = x1[nx] + l;
}
void add(int x)
{
	mp[x] = ++ii; x1[ii] = x;
	auto i1 = fp.lower_bound(x);
	if (i1 != fp.end()) haj[ii] = mp[*i1], nax[mp[*i1]] = ii;
	if (i1 != fp.begin()) nax[ii] = mp[*(--i1)], haj[mp[*i1]] = ii;
	fp.insert(x);
	i1 = fp.end();
	fr = *fp.begin(), sc = *(--i1);
	int v = ii;
	for (int i = 0; i <= T + 2; i++)
	{
		go(v);
		if (x1[v] == fr) break;
		v = nax[v];
	}
}
void rmv(int x)
{
	int ii = mp[x];
	mp[x] = 0;
	if (x != sc && x != fr) haj[nax[ii]] = haj[ii], nax[haj[ii]] = nax[ii];
	fp.erase(x);
	auto i1 = fp.end();
	fr = *fp.begin(), sc = *(--i1);
	int v = ii;
	for (int i = 0; i <= T + 2; i++)
	{
		if (x1[v] == fr) break;
		v = nax[v];
		go(v);
	}
}
int ans()
{
	int v = mp[fr], ret = 0;
	while (x1[v] <= sc)
	{
		ret += a[v];
		if (b[v] >= sc) break;
		v = mp[*fp.lower_bound(b[v] + 1)];
	}
	return ret;
}
void init(int N, int L, int X[])
{
	n = N; l = L;
	for (int i = 0; i < n; i++)
	{
		x[i] = X[i];
		if (cl[x[i]] == 0) add(x[i]);
		cl[x[i]]++;
	}
}

int update(int i, int y)
{
	cl[x[i]]--;
	if (cl[x[i]] == 0) rmv(x[i]);
	x[i] = y;
	cl[y]++;
	if (cl[y] == 1) add(y);
	return ans();
}

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 47
• Subtask 5: 0 / 3