Given an index k, return the kth row of the Pascal’s triangle.

For example, given k = 3,
Return [1,3,3,1].

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function getRow(rowIndex) {
        var leng = rowIndex+1;
        var number = new Array(leng);
        for(var k=0;k<leng;k++){
            number[k]=new Array(k+1);
            number[k][0]=1;
            number[k][k]=1;
        }
        for(var m=2;m<leng;m++){
            for(var n=1;n<m;n++){
                number[m][n]=number[m-1][n-1] +number[m-1][n];
            }
        }
        return number[rowIndex];
    }