From 93517c6629f3812e4236c27b3f99a949e6a87ded Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 20:28:26 +0800
Subject: [PATCH 01/28] 01

---
 01-hello.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/01-hello.rb b/01-hello.rb
index e0e7bbf..7a6fccc 100644
--- a/01-hello.rb
+++ b/01-hello.rb
@@ -5,4 +5,4 @@
 
 # ...
 
-puts "(请替换成最后的答案)"
\ No newline at end of file
+puts "hollo, #{your_name}"

From 8094a57476acb81310855907fcb1525471195ee0 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 20:35:16 +0800
Subject: [PATCH 02/28] 02

---
 02-variable.rb | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/02-variable.rb b/02-variable.rb
index a5a4753..6c977db 100644
--- a/02-variable.rb
+++ b/02-variable.rb
@@ -8,6 +8,5 @@
 
 # ...
 
-puts "a 应该是 2，现在是 #{a}"
-puts "b 应该是 1，现在是 #{b}"
-
+puts "a 应该是 #{a}，现在是 #{b}"
+puts "b 应该是 #{b}，现在是 #{a}"

From d857a9d7f721d0606224500b19c8a850d890fc7e Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 20:50:21 +0800
Subject: [PATCH 03/28] 03

---
 03-triangle.rb | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/03-triangle.rb b/03-triangle.rb
index fafec03..ccedf19 100644
--- a/03-triangle.rb
+++ b/03-triangle.rb
@@ -7,5 +7,5 @@
 b = gets
 
 # .....
-
-puts "直角三角形的面积是: _________"
\ No newline at end of file
+c = a.to_i * b.to_i / 2
+puts "直角三角形的面积是: #{c}"

From a924395e3830fd0ec401bbc32f2c0ae85fe15e43 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 20:56:24 +0800
Subject: [PATCH 04/28] 04

---
 04-pizzas.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/04-pizzas.rb b/04-pizzas.rb
index 4c2521f..d4dca43 100644
--- a/04-pizzas.rb
+++ b/04-pizzas.rb
@@ -8,5 +8,7 @@
 
 # .....
 
-puts "每人可分得几片: _________ 片"
-puts "还剩下几片: _________ 片"
\ No newline at end of file
+a = pizzas.to_i / people.to_i
+b = pizzas.to_i % people.to_i
+puts "每人可分得几片: #{a} 片"
+puts "还剩下几片: #{b} 片"

From 8fe888f50a1dc61569fe7696a1aa94af6b7378f6 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 21:20:37 +0800
Subject: [PATCH 05/28] 05

---
 05-bmi.rb | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/05-bmi.rb b/05-bmi.rb
index 67efdff..f63db98 100644
--- a/05-bmi.rb
+++ b/05-bmi.rb
@@ -12,6 +12,18 @@
 
 # .....
 
-puts "您的 BMI 是: _________"
+a = weight.to_i
+b = height.to_f / 100
+c = a / (b * b)
 
-puts "您的 BMI 结果是: _________(过轻或正常或过重)"
\ No newline at end of file
+if c < 18.5
+  d = "过轻"
+elsif c >= 24
+  d = "过重"
+else d = "正常"
+
+end
+
+puts "您的 BMI 是: #{c}"
+
+puts "您的 BMI 结果是: #{d}"

From b86bcc596618294634574935ec714df6d2964a05 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 21:48:37 +0800
Subject: [PATCH 06/28] 06

---
 06-interger-positive.rb | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/06-interger-positive.rb b/06-interger-positive.rb
index a240f5f..d0c2ed8 100644
--- a/06-interger-positive.rb
+++ b/06-interger-positive.rb
@@ -5,6 +5,24 @@
 x = gets
 
 # ....
+a = x.to_i
 
-puts "这个数是_____ (正数或零或负数)"
-puts "这个数是_____ (偶数或奇数)"
\ No newline at end of file
+if a > 0
+  b = "正数"
+elsif a == 0
+  b = "零"
+else b = "负数"
+
+end
+if a > 0
+
+if a % 2 == 0
+  c = "偶数"
+else
+  c = "奇数"
+end
+
+end
+
+puts "这个数是: #{b}"
+puts "这个数是: #{c}"

From 8232e270cb6de89465dd8e82076e294e9efc598d Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 22:11:42 +0800
Subject: [PATCH 07/28] 07

---
 07-abcde.rb | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/07-abcde.rb b/07-abcde.rb
index 5d0c8c3..32cb39f 100644
--- a/07-abcde.rb
+++ b/07-abcde.rb
@@ -11,6 +11,7 @@
 print "请输入一个整数x，然后按 Enter: "
 x = gets
 
+
 print "请输入一个整数y，然后按 Enter: "
 y = gets
 
@@ -19,4 +20,23 @@
 
 # ....
 
-puts "结果是________(A或B或C或D或E)"
\ No newline at end of file
+a = x.to_f
+b = y.to_f
+c = z.to_f
+
+if a < 0
+  h = "A"
+elsif a > 0 && b > 0 && c > 0
+  h = "B"
+  elsif a > 0 && b > 0 && c < 0
+    h = "C"
+  elsif a > 0 && b < 0 && c > 0
+    h = "D"
+  elsif a > 0 && b < 0 && c < 0
+    h = "E"
+end
+
+
+
+
+puts "结果是:#{h}"

From d92facec7fe9e413436e030cbce37bae1563f54b Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Mon, 28 Aug 2017 22:36:43 +0800
Subject: [PATCH 08/28] 08

---
 08-find-max.rb | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/08-find-max.rb b/08-find-max.rb
index 9e6e643..dca086c 100644
--- a/08-find-max.rb
+++ b/08-find-max.rb
@@ -11,4 +11,21 @@
 
 # ....
 
-puts "最大的数是 ________(x或y或z)"
\ No newline at end of file
+x = x.to_f
+y = y.to_f
+z = z.to_f
+
+# if x > y && x > z
+#   h = "x"
+# elsif y > x && y > z
+#   h = "y"
+# elsif z > x && z > y
+#   h = "z"
+# else
+#   puts "无法求解"
+#
+# end
+
+h = [x, y, z].max.to_i
+
+puts "最大的数是: #{h}"

From e9867911ad926b2f4a00f9a1f8dd0dbab5f941cd Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:01:23 +0800
Subject: [PATCH 09/28] 09

---
 09-function.rb | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/09-function.rb b/09-function.rb
index b1f922d..9e760c5 100644
--- a/09-function.rb
+++ b/09-function.rb
@@ -1,15 +1,18 @@
 # 题目: 输入直角三角形的宽和高，输出三角形的面积
 
 def calculate_area(a, b)
-  # ....
+  a * b / 2
 end
 
 print "请输入直角三角形的高，然后按 Enter: "
-a = gets
+a = gets.to_i
 
 print "请输入直角三角形的底边，然后按 Enter: "
-b = gets
+b = gets.to_i
+
+
+
 
 answer = calculate_area(a,b)
 
-puts "直角三角形的面积是: #{answer}"
\ No newline at end of file
+puts "直角三角形的面积是: #{answer}"

From 3d3bbd77f5b8318c555b29b42d6676a8b6a8ca19 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:04:10 +0800
Subject: [PATCH 10/28] 10

---
 10-function.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/10-function.rb b/10-function.rb
index bb450fb..0177819 100644
--- a/10-function.rb
+++ b/10-function.rb
@@ -1,6 +1,7 @@
 # 题目: 使用者输入 x,y,z，请输出三个数中最大的数
 
 def find_max(x, y, z)
+  [x, y, z].max
 end
 
 print "请输入一个数字x，然后按 Enter: "
@@ -16,4 +17,4 @@ def find_max(x, y, z)
 
 answer = find_max(x,y,z)
 
-puts "最大的数是 #{answer}"
\ No newline at end of file
+puts "最大的数是 #{answer}"

From 12556cc9776e63d73ba0b2b81959afc5be32f1f5 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:10:57 +0800
Subject: [PATCH 11/28] 11

---
 11-seven.rb | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/11-seven.rb b/11-seven.rb
index 26c221d..2bfa19d 100644
--- a/11-seven.rb
+++ b/11-seven.rb
@@ -2,8 +2,11 @@
 
 i = 1
 while ( i <= 100 )
+  if i % 7 == 0
+    puts i
+  end
 
   # ....
 
   i+=1
-end
\ No newline at end of file
+end

From 240b632caad1737fe04be29587cd2f2ee74e713b Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:19:29 +0800
Subject: [PATCH 12/28] 12

---
 12-sum-even.rb | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/12-sum-even.rb b/12-sum-even.rb
index 73879bb..34f975c 100644
--- a/12-sum-even.rb
+++ b/12-sum-even.rb
@@ -4,10 +4,12 @@
 total = 0
 
 while ( i <= 100 )
-
+  if i % 2 == 0
+    total += i
+  end
   # ....
 
   i+=1
 end
 
-puts total
\ No newline at end of file
+puts total

From f89f4481cc04ffb7e1e17b63b6e2745961f2faa4 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:34:03 +0800
Subject: [PATCH 13/28] 13

---
 13-nn.rb | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/13-nn.rb b/13-nn.rb
index ac0a43b..f146bb6 100644
--- a/13-nn.rb
+++ b/13-nn.rb
@@ -1,11 +1,21 @@
 # 题目: 输入一个数字 N，输出 N * N 乘法表
 
 print "请输入数字 N，然后按 Enter: "
-n = gets
+n = gets.to_i
 
 # while ( ... )
 #   while ( ...)
 #
 #   end
 # end
+i = 0
+while (i <= n)
+  j = 0
+  while (j <= n)
+    h = i * j
+    puts "#{i} × #{j} = #{h}"
+    j += 1
+  end
 
+  i += 1
+end

From 31bf44d5c07daa5ed733dad7430bfd97898d6357 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 21:55:22 +0800
Subject: [PATCH 14/28] 14

---
 14-prime.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/14-prime.rb b/14-prime.rb
index 8cf1692..14d7b7c 100644
--- a/14-prime.rb
+++ b/14-prime.rb
@@ -2,6 +2,15 @@
 
 def is_prime(n)
 # ....
+  i = 2
+  while (i <= n/2)
+    if n % i == 0
+      return false
+    end
+    i += 1
+  end
+    return true
+
 end
 
 print "请输入数字 N，然后按 Enter: "

From e1ba34f4093a78b0e61b4d31b7c13526c63d571a Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 22:04:16 +0800
Subject: [PATCH 15/28] 15

---
 15-guess-number.rb | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/15-guess-number.rb b/15-guess-number.rb
index 48f9dca..2be5fc1 100644
--- a/15-guess-number.rb
+++ b/15-guess-number.rb
@@ -8,10 +8,14 @@
 
   #puts "太低了，再猜一次"
   #puts "太高了，再猜一次"
+  if n.to_i < target
+    puts "太低了，再猜一次"
+  elsif n.to_i > target
+    puts "太高了，再猜一次"
 
-  if n.to_i == target
+  else n.to_i == target
     puts "恭喜猜中啦! "
     break
   end
 
-end
\ No newline at end of file
+end

From 6c67a7622f9693ec374cd3a872bcf66e3f1523bc Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Tue, 29 Aug 2017 22:18:11 +0800
Subject: [PATCH 16/28] 16

---
 16-array-sum.rb | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/16-array-sum.rb b/16-array-sum.rb
index 9b4910b..5260142 100644
--- a/16-array-sum.rb
+++ b/16-array-sum.rb
@@ -2,10 +2,16 @@
 
 def find_max(array)
   #....
+  # array.max
+  b = 0
+  array.each do |a|
+    if b < a
+      b = a
+    end
+  end
 end
 
 arr = [8, 12, 36, 53, 9, 75, 3, 71, 59, 88]
 
 max = find_max(arr)
 puts "Max is #{max}" # 应该是 88
-

From 2c2c802cfce001bc8f715815b3895d37b13c44c7 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 21:17:46 +0800
Subject: [PATCH 17/28] 17

---
 17-array-stats.rb | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/17-array-stats.rb b/17-array-stats.rb
index 0af81bb..cc030c5 100644
--- a/17-array-stats.rb
+++ b/17-array-stats.rb
@@ -12,9 +12,16 @@
   end
 end
 
+sum = 0
+arr.each { |i| sum += i}
+average = sum/arr.size.to_f
+
+
+
+
 puts arr.to_s
 
-puts "总和是 _____"
-puts "平均是 _____"
-puts "最大值是 _____"
-puts "最小值是 _____"
\ No newline at end of file
+puts "总和是 #{sum}"
+puts "平均是 #{average}"
+puts "最大值是 #{arr.max}"
+puts "最小值是 #{arr.min}"

From fab47ee3a3a8b74c489043210b2a0b186a194469 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 21:26:07 +0800
Subject: [PATCH 18/28] 18

---
 18-square.rb | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/18-square.rb b/18-square.rb
index 226e1c1..d51dd9a 100644
--- a/18-square.rb
+++ b/18-square.rb
@@ -3,8 +3,17 @@
 arr = []
 
 print "请输入数字 N，然后按 Enter: "
-n = gets
+n = gets.to_i
 
 # ...
+# i = 0
+# while i < n
+#   arr << i * i
+#   i += 1
+# end
 
-puts arr.to_s
\ No newline at end of file
+(0..n).each_with_index do |i, j|
+  arr << j ** 2
+end
+
+puts arr.to_s

From ccf302ddfbfcb8519010e9e4088fdbe793cf4546 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 21:41:53 +0800
Subject: [PATCH 19/28] 19

---
 19-filter.rb | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/19-filter.rb b/19-filter.rb
index ef7e515..44e7e17 100644
--- a/19-filter.rb
+++ b/19-filter.rb
@@ -2,8 +2,16 @@
 
 def filter_even(arr)
   #...
+  new_array = []
+
+  arr.each do |i|
+    if i % 2 == 0
+      new_array << i
+    end
+  end
+  print "#{new_array}"
 end
 
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
-puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]
\ No newline at end of file
+puts filter_even(arr).to_s # 应该是 [68, 42, 46, 46, 86]

From 5dc0c7a8f7d190f30c01de0f98c11a0dbeccce05 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 21:49:55 +0800
Subject: [PATCH 20/28] 20

---
 20-sorting.rb | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/20-sorting.rb b/20-sorting.rb
index 5f82c08..163937f 100644
--- a/20-sorting.rb
+++ b/20-sorting.rb
@@ -2,10 +2,19 @@
 # Hint: 可用 arr.sort 排序，和 arr.uniq 去除重复
 
 def filter_even(arr)
-  #...
+  new_array = []
+
+  arr.each do |i|
+    if i % 2 == 0
+      new_array << i
+    end
+  end
+  print "#{new_array.sort.uniq}"
 end
 
+
+
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
 
-puts "________" # 应该是 [42, 46, 68, 86]
\ No newline at end of file
+puts "#{filter_even(arr)}" # 应该是 [42, 46, 68, 86]

From a36406f626f015b8fa2510adc8098afc3d51b89f Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 22:30:26 +0800
Subject: [PATCH 21/28] 21

---
 21-selection-sort.rb | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/21-selection-sort.rb b/21-selection-sort.rb
index e5e7eae..320347d 100644
--- a/21-selection-sort.rb
+++ b/21-selection-sort.rb
@@ -3,10 +3,37 @@
 
 def selection_sort(arr)
   #...
+
+#   i = 0
+#   j = 1
+#   s = arr.size.to_i
+#   while i <= s - 1
+#     min = arr[i]
+#     while j <= s - 1
+#       if min > arr[j]
+#         arr[i] = arr[j]
+#         arr[j] = min
+#         min = arr[i]
+#       end
+#       j += 1
+#     end
+#     i += 1
+#     j = i + 1
+#   end
+#   arr
+# end
+
+  (0...arr.size).each do |i|
+    min, index = arr[i], i
+    (i...arr.size).each { |j| min, index = arr[j], j if arr[j] < min }
+    arr[i], arr[index] = arr[index], arr[i]
+  end
+  arr
 end
 
+
 arr =  [7, 68, 42, 46, 9, 91, 77, 46, 86, 1]
 
 answer = selection_sort(arr)
 
-puts answer.to_s # 应该是 [1, 7, 9, 42, 46, 46, 68, 77, 86, 91]
\ No newline at end of file
+puts answer.to_s # 应该是 [1, 7, 9, 42, 46, 46, 68, 77, 86, 91]

From a4b4dec4971841841b6637d3402470bd6b021790 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 22:36:55 +0800
Subject: [PATCH 22/28] 22

---
 22-missing.rb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/22-missing.rb b/22-missing.rb
index 6898714..a810164 100644
--- a/22-missing.rb
+++ b/22-missing.rb
@@ -2,6 +2,11 @@
 
 def find_missing(arr)
   # ...
+  new_array = []
+  (0..9).each do |i|
+    new_array << i unless arr.include?(i)
+  end
+  new_array
 end
 
 answer = find_missing( [2,2,1,5,8,4] )

From 8ff94787dddbdd319d257ace50531c0d42a6e073 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 22:43:22 +0800
Subject: [PATCH 23/28] 23

---
 23-hash-max.rb | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/23-hash-max.rb b/23-hash-max.rb
index 6fb227e..dfca6fc 100644
--- a/23-hash-max.rb
+++ b/23-hash-max.rb
@@ -1,7 +1,8 @@
 # 给定一 Hash，输出有最大 value 的 key
 
-def find_max(hash)
+def find_max(h)
   # ...
+  h.values.max
 end
 
 h = {
@@ -15,5 +16,3 @@ def find_max(hash)
 answer = find_max(h)
 
 puts "有最大 value 的是 #{answer}" # 应该是 d
-
-

From 793e469c6efb50b0afbb3d481a068852e4118acc Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Wed, 30 Aug 2017 22:56:35 +0800
Subject: [PATCH 24/28] 24

---
 24-hash-even.rb | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/24-hash-even.rb b/24-hash-even.rb
index 9da9605..7d29d18 100644
--- a/24-hash-even.rb
+++ b/24-hash-even.rb
@@ -1,9 +1,15 @@
 # 给定一 Hash，输出 value 是偶数的 keys
 
-def find_even_keys(hash)
+def find_even_keys(h)
 
   # ... (请回传一个数组)
-
+  new_array = []
+  h.each do |key, value|
+    if value % 2 == 0
+      new_array << key
+    end
+  end
+  new_array
 end
 
 h = {
@@ -17,5 +23,3 @@ def find_even_keys(hash)
 answer = find_even_keys(h)
 
 puts "有偶数 value 的 keys 有 #{answer}" # 应该是数组 [b,d,e]
-
-

From 6cb3b387a621aff024a17262163640cd98703d7e Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Thu, 31 Aug 2017 21:59:51 +0800
Subject: [PATCH 25/28] 26

---
 25-hash-count.rb  |  4 +++-
 26-hash-filter.rb | 18 +++++++++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/25-hash-count.rb b/25-hash-count.rb
index 2167335..3b7e694 100644
--- a/25-hash-count.rb
+++ b/25-hash-count.rb
@@ -5,8 +5,11 @@ def count(arr)
 
   arr.each do |i|
     # ...
+    frenquency = arr.count(i)
+    h[i] = frenquency
   end
 
+
   return h # 回传一个 hash
 end
 
@@ -15,4 +18,3 @@ def count(arr)
 answer = count(arr)
 
 puts answer # 答案应该是 {"a"=>3, "d"=>6, "c"=>5, "b"=>1, "e"=>5}
-
diff --git a/26-hash-filter.rb b/26-hash-filter.rb
index 51ade64..5563559 100644
--- a/26-hash-filter.rb
+++ b/26-hash-filter.rb
@@ -10,7 +10,23 @@
 
 # ....
 
-puts "所有成年人，并由小到大: _________"
+
+# def filter_array(arr)
+#   result_arr = []
+#   arr.each do |h|
+#     if h["age"] >= 18
+#       result_arr.push(h)
+#     end
+#   end
+#   result_arr.sort_by { |i| i["age"]}
+# end
+
+def filter_array(arr)
+  arr.sort_by { |i| i["age"]}.select { |a| a["age"] >= 18}
+end
+
+
+puts "所有成年人，并由小到大: #{filter_array(arr)}"
 
 # 答案应该是
 #[

From 87270d5af489be93124e25bc55d8dd9523840006 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Thu, 31 Aug 2017 22:03:45 +0800
Subject: [PATCH 26/28] 27

---
 27-class.rb | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/27-class.rb b/27-class.rb
index 8cec2c9..4ba539c 100644
--- a/27-class.rb
+++ b/27-class.rb
@@ -1,5 +1,12 @@
 class Person
   # ...
+  attr_accessor :first_name
+  attr_accessor :last_name
+
+  def greet
+    puts "Hello, #{@first_name} #{@last_name}"
+  end
+  
 end
 
 p1 = Person.new
@@ -11,6 +18,3 @@ class Person
 p2.first_name = "William"
 p2.last_name = "Zhang"
 p2.greet # 输出 "Hello, William Zhang"
-
-
-

From 76fafb5308adef1022bac20ce88660b134bcc823 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Thu, 31 Aug 2017 22:08:03 +0800
Subject: [PATCH 27/28] 28

---
 28-word-count.rb | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/28-word-count.rb b/28-word-count.rb
index 2643123..496c519 100644
--- a/28-word-count.rb
+++ b/28-word-count.rb
@@ -2,4 +2,13 @@
 
 doc = File.read("wordcount.txt")
 
+arr = doc.split ("")
+h = {}
+arr.uniq.each do |i|
+  h[i] = arr.count(i)
+end
+puts h
+
+
+
 # ...

From 9acb6e8cd19d5e1a415b1b59841cd38efb1a47a8 Mon Sep 17 00:00:00 2001
From: liyangbin <liyanbin98@gmail.com>
Date: Thu, 31 Aug 2017 22:31:18 +0800
Subject: [PATCH 28/28] 29

---
 29-todos.rb | 17 ++++++++++++++++-
 dotos.txt   |  5 +++++
 2 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 dotos.txt

diff --git a/29-todos.rb b/29-todos.rb
index 0bddde2..c4e12e3 100644
--- a/29-todos.rb
+++ b/29-todos.rb
@@ -15,19 +15,34 @@
   print "请输入指令 1. add 2. remove 3. save，然后按 Enter: "
   command = gets.chomp
 
+  todo = nil
   if command == "add"
     print "请输入代办事项: "
     # ...
+    tode = gets.chomp
+    todos << todo
   elsif command == "remove"
     print "请输入要删除的编号: "
     # ...
+    remove = gets.chomp.to_i
+    todos.delete_at(remove)
   elsif command == "save"
+    File.open("dotos.txt", "w+") do |f|
+      todos.each do |i|
+        f << i
+        f << "\n"
+      end
+    end
+
     puts "存盘离开"
 
     # ...
+    puts "现代办事项为:"
+    todos.each_with_index do |todo, index|
+      puts "#{index}: #{todo}"
+    end
     break;
   else
     puts "看不懂，请再输入一次"
   end
 end
-
diff --git a/dotos.txt b/dotos.txt
new file mode 100644
index 0000000..fdca5f3
--- /dev/null
+++ b/dotos.txt
@@ -0,0 +1,5 @@
+Buy book
+Go Shopping
+Walk
+Gogo
+