Majority vote algorithm

Majority vote algorithm

int foo(int* a, int len)
{
 int tem=-1;
 int c=0;
 int idx=0;
 while(idx {
  if(c==0)
   {
    tmp=a[idx];
    c++;
   }
  else 
   {
    if(tmp!=a[idx])
     c--;
    else 
     c++;
   }
   idx++;
 }
 if(c>0)
  return tmp;
 else 
  return -1;
}