Cod sursa(job #71512)

Utilizator DastasIonescu Vlad Dastas Data 10 iulie 2007 20:33:40
Problema Secventa Scor 50
Compilator cpp Status done
Runda Arhiva de probleme Marime 1.31 kb
#include <cstdio>
#define maxn 500001

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

int n;
int k;
int a[maxn] = {0};

void read()
{
    fscanf(in, "%d %d", &n, &k);

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

struct deque
{
    int poz, v;
};

deque Q[maxn];

int main()
{
    read();

    int first = 1, last = 0;
    Q[first].v = a[1];
    Q[first].poz = 1;

    int max = -300000000;
    //int min = 300000000;
    int pmin = 0;

    for ( int i = 1; i <= n; ++i )
    {
        while ( first <= last && Q[first].poz <= i - k )
            ++first;
        while ( last >= first && Q[last].v >= a[i] )
            --last;

//        printf("%d \n", Q[first].v );

        ++last;
        Q[last].v = a[i];
        Q[last].poz = i;

        if ( Q[first].v > max && Q[first].poz > k )
            max = Q[first].v, pmin = Q[first].poz;

//        for ( int i = first; i <= last; ++i )
//            printf("%d ", Q[i].v);
//        printf("\n");
    }

//    printf("%d %d\n\n", first, last);

    int st = pmin;
    int dr = pmin;

    while ( a[st] >= max )
        --st;
    ++st;
    while ( a[dr] >= max && dr - st < k )
        ++dr;
    --dr;

    fprintf(out, "%d %d %d\n", st, dr, max);


    return 0;
}