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// Búsqueda binaria
// Agosto de 2009 Con Clase, Salvador Pozo
#include <iostream>
using namespace std;
int Binaria(int*, int, int, int);
int tabla[] = {
1, 3, 12, 33, 42, 43, 44, 45, 54, 55,
61, 63, 72, 73, 82, 83, 84, 85, 94, 95,
101, 103, 112, 133, 142, 143, 144, 145, 154, 155,
161, 163, 172, 173, 182, 183, 184, 185, 194, 195
};
int main() {
int pos;
int valor=141;
pos = Binaria(tabla, valor, 0, sizeof(tabla)/sizeof(tabla[0])-1);
if(pos > 0) cout << "Valor " << valor << " encontrado en posicion: " << pos << endl;
else cout << "Valor " << valor << " no encontrado" << endl;
return 0;
}
/* Función de búsqueda binaria:
Busca el "valor" dentro del vector "vec" entre los márgenes
inferior "i" y superior "s" */
int Binaria(int* vec, int valor, int i, int s) {
int inferior = i;
int superior = s;
int central;
do {
central = inferior+(superior-inferior)/2;
if(vec[central] == valor) return central;
else if(vec[central] < valor) inferior = central+1;
else superior = central-1;
} while(superior >= inferior);
return -1;
}
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