Problem link : https://codeforces.net/contest/1926/problem/D Submission : 247469924

My Approach Here I tried to make the groups of 2 integers whose xor will be 0. If we consider number of bits=3 then max possible number in binary = 111(7) and after flipping the bits it will be 000(0). lets take a number 101(5) after flipping bits it will be 010(2) (as we are considering only 3 bits) then i concluded to get the number after flipping the bits we should do (maxPossibleNumber — currNumber) -> this gives the number after flip. In the same way I formed the groups for 11 bits maxnum=2147483647 for the given problem. But im getting TLE for this code. But unable to figure out why im getting TLE. Please help me out in this.