@zLuki I found coefficient overflows when calling Math.power(); I updated my translation forking and fixed it.

Ramdon test in scala translation does not consider about coefficient overflowing.For example, the test result for (94y+61)^10 is :

9223372036854775807y^10-961308041025291264y^9+6121785086088746240y^8-4582317386841517056y^7-4811371201041625984y^6-5944637292997808512y^5-3836174666249668576y^4-357219367422425792y^3+2439685499140664756y^2-7454246746445460016y+713342911662882560

, but the correct one is

9223372036854775807y^10+349526829359456189440y^9+1020692709140114085120y^8+1766305113689275438080y^7+2005883732833299500160y^6+1562028608972314078848y^5+844714052724389705760y^4+313237429885639951680y^3+76226661793978871220y^2+10992497327264091600y+713342911662882560

--- Obviously, the coefficients in this case must be positive number.
I fix it in https://www.codewars.com/kumite/604f5f1d754bcc000b66b109?sel=6294bef3c7f2d3006151cadd , please review.

@hobovsky I fix this overflow error: https://www.codewars.com/kumite/604f5f1d754bcc000b66b109?sel=6294bef3c7f2d3006151cadd