Submission #352345

#	Time	Username	Problem	Language	Result	Execution time	Memory
352345		hivakarami	Dancing Elephants (IOI11_elephants)	C++14	0 / 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 = 1e5 + 5;
const int sq = 500;
const ll mod = 1e9 + 7;
const ll inf = 1e16;

int n, len, q = 0, *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)
{
	//cout << "id : "<< id << endl;
	int m = v[id].size();
	nx[id][m-1] = v[id][m-1] + len;
	dp[id][m-1] = 1;
	for(int i = m - 2; i >= 0; i--)
	{
		if(v[id][m-1] > v[id][i]+len)
		{
			auto it = upper_bound(v[id].begin(), v[id].end(), v[id][i]+len);
			int p = it - v[id].begin();
			nx[id][i] = nx[id][p];
			dp[id][i] = dp[id][p] + 1;
		}
		else
		{
			dp[id][i] = 1;
			nx[id][i] = v[id][i] + len;
		}
	}
	
	
	//for(int i = m-1; i >= 0; i--)
		//cout << nx[id][i] << ' ' << dp[id][i] << endl;
	
	
}


void build()
{
	sort(x, x + n);	
	n = unique(x, x+n) - x;	
	
	for(int i = 0; i < sq; i++)
		v[i].clear();

	int id = 0;
	for(int i = 0; i < n; i++)
	{
		v[id].push_back(x[i]);
		if(v[id].size() == sq)
		{
			bld(id);
			id++;
		}
	}
	if(v[id].size() != 0)
		bld(id);
	
	//cout << "////////" << endl;
	
}


void add(int k, bool b)
{
	int id = 0;
	for(int i = 0; i < sq; i++)
	{
		if(v[i].size() != 0 && v[i][0] <= k)
		{
			id = i;
			break;
		}
	}
	//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);
				v[id].push_back(y);
				fl = true;
			}
		}
		
		if(!fl)
			v[id].push_back(k);
		
	}	
		

	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;
	for(int i = 0; i < sq; i++)
	{
		if(j < v[i].size())
			ans += dp[i][j];
		if(v[i+1].empty())
			break;
		j = upper_bound(v[i+1].begin(), v[i+1].end(), nx[i][j]) - v[i+1].begin();
	}
	
	return ans;
	
}

/*
int main()
{
	cin >> n >> len;
	for(int i = 0; i < n; i++)
	{
		cin >> x[i]; 
		cnt[x[i]]++;
	}
	
	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:160:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |   if(j < v[i].size())
      |      ~~^~~~~~~~~~~~~

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