Submission #353887

#	Time	Username	Problem	Language	Result	Execution time	Memory
353887		hivakarami	Dancing Elephants (IOI11_elephants)	C++14	10 / 100	1 ms	364 KiB

elephants

#include "elephants.h"
#include<bits/stdc++.h>
 
using namespace std;
 
typedef long long int ll;
typedef long double ld;
#define f first
#define s second
 
const int N = 15e4 + 100;
const int sq = 500;
const ll mod = 1e9 + 7;
const ll inf = 1e16;
 
int n, len, q = 0, sz = 0;
//int x[N];
int *x;
vector<int> v[sq], tmp;
int nx[sq][N], dp[sq][N];
map<int, int> cnt;
//*
void init(int N, int L, int X[])
{
	n = N;
	len = L;
	x = X;
	for(int i = 0; i < n; i++)
		cnt[x[i]]++;
		
}
//*/
 
void bld(int id)
{
	int m = v[id].size();
	nx[id][m-1] = v[id][m-1] + len;
	dp[id][m-1] = 1;
	int pt = m;
	for(int i = m - 1; i >= 0; i--)
	{
		while(pt > 0 && v[id][pt-1] > v[id][i] + len)
			pt--;
		if(pt >= m)
		{
			dp[id][i] = 1;
			nx[id][i] = v[id][i] + len;
		}
		else
		{
			dp[id][i] = dp[id][pt] + 1;
			nx[id][i] = nx[id][pt];
		}
	}
}
 
 
void build()
{
	sort(x, x + n);	
	n = unique(x, x+n) - x;	
	
	for(int i = 0; i < sq; i++)
		v[i].clear();
 
	sz = 0;
	for(int i = 0; i < n; i++)
	{
		v[sz].push_back(x[i]);
		if(v[sz].size() == sq+1)
		{
			bld(sz);
			sz++;
		}
	}
	if(v[sz].size() != 0)
		bld(sz++);
	//cout << "////////" << endl;
	
}
 
 
void add(int k, bool b)
{
	int id = 0;
	while(id < sz-1 && k > v[id+1][0])
		id++;
	
	//cout << k << ' ' << id << endl;
	
	//for(auto a : v[id])
		//cout << a << ' ';
	//cout << endl;
	
	if(!b)
	{
		tmp = v[id];
		v[id].clear();
		for(auto y : tmp)
		{
			if(y != k)
				v[id].push_back(y);
		}
			
	}	
	else
	{
		bool fl = false;
		tmp = v[id];
		v[id].clear();
		for(auto y : tmp)
		{
			if(y > k)
			{
				v[id].push_back(k);
				fl = true;
			}
			v[id].push_back(y);
		}
		
		if(!fl)
			v[id].push_back(k);
		
	}	
		
	//for(auto y : v[id])
		//cout << y << ' ';
	//cout << endl;	
 
	bld(id);
 
}
 
 
 
int update(int i, int y)
{
	if(q%sq == 0)
		build();
	q++;
	
	
	cnt[x[i]]--;
	if(cnt[x[i]] == 0)
		add(x[i], 0);
	
	x[i] = y;
	if(cnt[x[i]] == 0)
		add(x[i], 1);
	cnt[y]++;
	
	int j = 0, ans = 0, t = -1;
	for(int i = 0; i < sz; i++)
	{
		j = upper_bound(v[i].begin(), v[i].end(), t) - v[i].begin();
		if(j < v[i].size())
		{
			ans += dp[i][j];
			t = nx[i][j];
		}
	}
	
	return ans;
	
}
 
/*
int main()
{
	cin >> n >> len;
	for(int i = 0; i < n; i++)
	{
		cin >> x[i]; 
		cnt[x[i]]++;
	}
	
	int qu;
	cin >> qu;
	while(qu--)
	{
		int a, b;
		cin >> a >> b;
		cout << update(a, b) << endl;
	}
	
	return 0;
		
}
//*/

Compilation message (stderr)

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:156:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |   if(j < v[i].size())
      |      ~~^~~~~~~~~~~~~

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