Answer Happy

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#include<stdio.h>
int power(int x, int y)
{
if (y == 0)
return 1;
else if (y%2 == 0)
return power(x, y/2)*power(x, y/2);
else
return x*power(x, y/2)*power(x, y/2);
}
int main()
{
int x = 2;
int y = 3;
 
printf("%d", power(x, y));
return 0;
}
a) O(1)
b) O(n)
c) O(log n)
d) O(n log n)