Cod sursa(job #394150)

Utilizator toni2007Pripoae Teodor Anton toni2007 Data 10 februarie 2010 17:04:33
Problema Cautare binara Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.37 kb
#include <stdio.h>
#include <stdlib.h>
#define N 100010
int v[N];

int bsearch0 (int p, int u, int key) {
    int m;

    while (p <= u) {
        m = (p + u) / 2;
        if (v[m] <= key)
            p = m + 1;
        else
            u = m - 1;
    }
    m = (p + u) / 2;

    if (v[m] > key) m --;
    if (v[m] == key)
        return m;
    return -1;
}

int bsearch1 (int p, int u, int key) {
    int m, n = u;

    while (p < u){
        m = (p + u) / 2;
        if (v[m] <= key)
            p = m + 1;
        else
            u = m;
    }

    m = (p + u) / 2;
    if (v[m] > key)
       -- m;
    return m;
}

int bsearch2 (int p, int u, int key) {
    int m;

    while (p < u) {
        m = (p + u) / 2;
        if (v[m] < key)
            p = m + 1;
        else
            u = m;
    }
    
    m = (p + u) / 2;
    if (v[m] < key)
       ++ m;
    return m;
}

int main () {
    int i, n, m, tip, val;

    freopen("cautbin.in","r",stdin);
    freopen("cautbin.out","w",stdout);
    scanf("%d", &n);
    for (i = 1; i <= n; ++ i)
        scanf("%d", &v[i]);
    
    scanf("%d", &m);

    while (m --){
          scanf("%d%d", &tip, &val);
          if (tip == 0)
             printf("%d\n", bsearch0(1, n, val));
          if (tip == 1)
             printf("%d\n", bsearch1(1, n, val));
          if (tip == 2)
             printf("%d\n", bsearch2(1, n, val));
    }
    exit(0);
}