#include<stdio.h>
const n=8;
int tab[n]={2,3,5,1,5,6,2,9};
void minmax(int,int,int*,int*);
main()
{int m=tab[0],M=tab[0];
 minmax(0,n-1,&m,&M);
 printf("m=%d,M=%d",tab[m],tab[M]);
}
void minmax(int i,int j,int *am,int *aM)
{int m1,m2,M1,M2,sr;
 if(i+1==j)
  {if(tab[j]>tab[i]){*am=i;*aM=j;}
   else             {*am=j;*aM=i;};
  }
 else
  { sr=(i+j)/2;
    minmax(i,sr,&m1,&M1);
    minmax(sr+1,j,&m2,&M2);
    *am =(tab[m2]>tab[m1])? m1 : m2;
    *aM =(tab[M1]>tab[M2])? M1 : M2;
  }
}