Cod sursa(job #603677)

Utilizator Bit_MasterAlexandru-Iancu Caragicu Bit_Master Data 18 iulie 2011 12:59:44
Problema Secventa Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.26 kb
/*
	determin prima subsecventa de lungime k valida
    o extind cat de mult pot spre stanga
*/

#include <cstdio>
#include <deque>
using namespace std;

const int N = 500005;

deque<int> dq;
int v[N],n,k;
int sol_min,sol_p,sol_q;

void citire()
{
	scanf("%d%d",&n,&k);
	for (int i = 1; i <= n; ++i)
		scanf("%d",&v[i]);
}

inline int val_minima()
{
	return v[dq.front()];
}

void adaugare_dq(int poz)
{
	while ((!dq.empty()) && (v[dq.back()] >= v[poz]))
		dq.pop_back();
	dq.push_back(poz);
}

void eliminare_dq(int poz)
{
	if (dq.front() == poz)
		dq.pop_front();
}

void adaugare_primele_k_elemente()
{
	for (int i = 1; i <= k; ++i)
		adaugare_dq(i);
}

void parcurgere()
{
	adaugare_primele_k_elemente();
	sol_min = val_minima();
	sol_p = 1;
	sol_q = k;
	for (int i = 2; i <= n-k+1; ++i)
	{
		//avansare
		eliminare_dq(i-1);
		adaugare_dq(i+k-1);
		//verificare
		if (val_minima() > sol_min)
		{
			sol_min = val_minima();
			sol_p = i;
			sol_q = i+k-1;
		}
	}
}

void extindere()
{
	while (v[sol_p-1] > sol_min)
		--sol_p;
}

int main()
{
	freopen("secventa.in","r",stdin);
	freopen("secventa.out","w",stdout);
	citire();
	parcurgere();
	//extindere();
	printf("%d %d %d",sol_p,sol_q,sol_min);
	return 0;
}