class?Solution?{
????/**
?????*?@param?Integer?$n
?????*?@return?Integer
?????*/
????function?sumNums($n)?{
????????$num?=?0;
????????$n>0?and?$num?=?$n?+?$this->sumNums($n-1);
????????return?$num;
????}
}
class?Solution?{
????/**
?????*?@param?Integer?$n
?????*?@return?Integer
?????*/
????function?sumNums($n)?{
????????$num?=?0;
????????$n>0?and?$num?=?$n?+?$this->sumNums($n-1);
????????return?$num;
????}
}