public static boolean isRowMagic(int[][] a){
        int[] rows=allRowSums(a);
        int i=1;
        boolean isMagic=true;
        while(i<rows.length&&isMagic){
            isMagic=rows[i-1]==rows[i];
        }
        return isMagic;
    }

    public static boolean isColumnMagic(int[][] a){
        int[]cols=allColSums(a);
        boolean isMagic=true;
        int i=1;
        while(i<cols.length&&isMagic){
            isMagic=cols[i-1]==cols[i];
        }
        return isMagic;
    }