I am struggling to understand why on earth this usecase expects YES: x1 = 0 x2 = 3 v1 = 4 v2 = 2 If the first jump gets x1 at position 4 and x2 at position 5 then in teh second jump x1 surpass x2 and stays ahead from there onwards.

def kangaroo(x1, v1, x2, v2):

if v1 > v2 and (x1 - x2) % (v1 - v2) == 0:
    return 'YES'
return 'NO'

def kangaroo(x1, v1, x2, v2): if v1 > v2 and (x1 - x2) % (v1 - v2) == 0: return 'YES' return 'NO'

This is my solution in perl

# Write your code here
my (`$x1, $`v1, `$x2, $`v2) = @_;    
if( `$v1 > $`v2 && (`$x2 - $`x1) % (`$v1 - $`v2) == 0)   {
    return "YES";
}else{
    return "NO";
}

Here is my c++ solution, you can have the explanation here : https://youtu.be/bRVVCCmXN0Y

string kangaroo(int x1, int v1, int x2, int v2) {
    if(v1 > v2 && (x2-x1) % (v1-v2) == 0) return "YES";
    return "NO";
}