Cod sursa(job #2075001)

Utilizator SoranaAureliaCatrina Sorana SoranaAurelia Data 25 noiembrie 2017 10:41:36
Problema Cautare binara Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 0.85 kb
#include <cstdio>
using namespace std;
int n, m, a[100001], tip, x;

int tip01(int l, int x)
{
    int i;
    for(l, i=0;l;l>>=1)
        if(i + l <= n && a[i + l] <= x)
            i+=l;
    if(a[i]!=x)
        return -1;
    return i;
}

int tip2(int l, int x)
{
    int i;
    for(l, i=n;l;l>>=1)
        if(i - l >0 && a[i - l] >= x)
            i-=l;
    return i;
}
int main()
{
    freopen("cautbin.in","r", stdin);
    freopen("cautbin.out", "w", stdout);
    scanf("%d", &n);
    for(int i=1; i<=n; i++)
        scanf("%d", &a[i]);
    scanf("\n");
    int lg;
    for(lg=1; lg<=n; lg<<=1);

    scanf("%d", &m);
    for(int j=1; j<=m; j++)
    {
        scanf("%d %d\n", &tip, &x);
        if(tip!=2)
            printf("%d\n", tip01(lg, x));
        else
            printf("%d\n", tip2(lg, x));
    }
    return 0;
}