Why is the following code falling 3 of 10 test cases

#1

bool floydCycleRemoval(Node * head)
{
/* Code here /
Node f = head;
Node* s = head;

while ( f != NULL && f->next != NULL ){
    f = f->next->next;
    s = s->next;
    if ( f == s){
    	break;
    }

}
if( f->next == NULL || f == NULL){
    return false;
}
else{
    s = head;
    while( s->next != f->next){
        s = s->next;
        f = f->next;
    }
    f->next = NULL;
    return true;
}

}

#2

@snatchit question link?

#3

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