Cod sursa(job #592763)

Utilizator cipri20Ilinca Ciprian cipri20 Data 30 mai 2011 17:38:42
Problema Secventa Scor 80
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.45 kb
#include <stdio.h>

FILE *in = fopen("secventa.in","r"), *out = fopen("secventa.out","w");

const int maxn = 500001;
int n, k;
int a[maxn];

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

void brut()
{
    int inc, sf, maxim = -1000000000;
    for (int i = 1; i <= n - k + 1; ++i)
    {
        int min = a[i];
        for (int j = i; j <= i + k - 1; ++j)
            if (a[j] < min)
                min = a[j];

        if (min > maxim)
        {
            maxim = min;
            inc = i;
            sf = i + k - 1;
        }
    }

    fprintf(out, "%d %d %d", inc, sf, maxim);
}

int deque[maxn], p, u;
void optim()
{
    p = 1;
    u = 0;
    int maxim = -1000000000, inc, sf;

    for (int i = 1; i < k; ++i)
    {
        while (p <= u && a[ deque[u] ] > a[i])
            --u;
        if (p <= u && deque[p] <= i - k)
            ++p;

        deque[++u] = i;
    }

    for (int i = k; i <= n; ++i)
    {
        while (p <= u && a[ deque[u] ] > a[i])
            --u;
        if (p <= u && deque[p] <= i - k)
            ++p;

        deque[++u] = i;
        if (a[ deque[p] ] > maxim)
        {
            maxim = a[ deque[p] ];
            inc = i - k + 1;
            sf = i;
        }
    }

    fprintf(out, "%d %d %d", inc, sf, maxim);
}

int main()
{
    citire();
    //brut();
    optim();

    return 0;
}