Help me in solving SPCP3 problem

help
,
1

My issue

what is error in my code. it fails at a hidden testcase

My code

# cook your dish here
def marblebig(x,y):
    c = 0
    while x%y!=0:
        x+=1
        y-=1
        c+=1
    return c
def marblesmall(x,y):
    c = 0
    while y%x!=0:
        x-=1
        y+=1
        c+=1
    return c

def marble(x,y):
    if x%y==0 or y%x == 0:
        return 0
    if x>y:
        a = marblesmall(x,y)
        b = marblebig(x,y)
        return min([a,b])
    return marblebig(x,y)

t=int(input())
for _ in range(t):
    a,b=map(int,input().split())
    print(marble(a,b))

Problem Link: Marbles Practice Coding Problem

2

@anuskcse
plzz refer my c++ code for better understanding of the logic

#include <iostream>
using namespace std;

int main() {
	// your code goes here
	int t;
	cin>>t;
	while(t--)
	{
	    int a,b;
	    cin>>a>>b;
	    int a1=a;
	    int b1=b;
	    int cnt=0;
	    while(b>1)
	    {
	        if(a%b==0)
	        {
	            
	            break;
	        }
	        a++;
	        b--;
	        cnt++;
	    }
	  //  cout<<cnt<<endl;
	    a=a1;
	    b=b1;
	    int ans=cnt;
	    cnt=0;
	    while(a>1)
	    {
	        if(a%b==0)
	        {
	       ans=min(ans,cnt);
	        break;
	        }
	        a--;
	        b++;
	        cnt++;
	       
	    }
	   // ans=min(ans,cnt);
	    cout<<ans<<endl;
	}
	return 0;
}