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    My code:-

    public static String kangaroo(int x1, int v1, int x2, int v2) { while(!((v1>v2&&x1>x2)||(v2>v1&&x2>x1)||(v1==v2&&x1!=x2))) { if(x1==x2) return "YES"; x1+=v1; x2+=v2; } return "NO"; }