it is very simple......just think that for sufficiently large n...the
number of times the loop runs will be depend upon wat ?
for example
for(int i=0 to n)
{
  for(int =0 to n)
  {
  //operations
  //
  }
}
for this the time complexity is O(n^2)
because for every i..it runs n times.....
for lg n it is more likely to form a binary tree....it is just 2 often used
term....for more ,refer algorithms book by thomas coreman

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