From bc197a226b725fce8f8a78cab87e3376cf002e61 Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 21:51:39 +0800
Subject: [PATCH 01/11] Swift version of AB - CD = EF + GH = PPP

 AB - CD = EF + GH = PPP
Example for Swift as use backward finding.
---
 Swift/abcdefghppp.swift | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 Swift/abcdefghppp.swift

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
new file mode 100644
index 0000000..71b8ec6
--- /dev/null
+++ b/Swift/abcdefghppp.swift
@@ -0,0 +1,37 @@
+//: Tested on Xcode 7.3 Playground
+
+import Cocoa
+
+
+var p = 1;
+
+// g start from 1 because no 0 and p=1
+for g in 2...9{
+    for h in 0...9{
+        if h==p||g==h{
+            continue}
+        // ef = 111-gh
+            var ef = (p*100+p*10+p)-(g*10+h)
+            var e = ef/10
+            var f = ef%10
+        
+        //ef + cd = ab
+            for c in 1...9{
+                for d in 0...9{
+                    if c==p||d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==f||d==f||c==d{
+                        continue}
+                        var ab = ef+c*10+d
+                        if ab>99{
+                            continue}
+                    
+                            var a = ab/10
+                            var b = ab%10
+                                if a==p||b==p||a==e||b==e||a==f||b==f||a==g||b==g||a==f||b==f||a==c||b==c||a==d||a==d||a==b{
+                                    continue}
+                                print("AB \(a)\(b)- CD \(c)\(d) = EF \(e)\(f) +GH \(g)\(h) = \(p)\(p)\(p)")
+                    
+                }
+            }
+        
+    }
+}

From 2e03469a2abf065bdff7f74c9ae053d17c8aaf02 Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 22:04:06 +0800
Subject: [PATCH 02/11] Update abcdefghppp.swift

Mistake checking code
---
 Swift/abcdefghppp.swift | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 71b8ec6..21578b0 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -18,7 +18,7 @@ for g in 2...9{
         //ef + cd = ab
             for c in 1...9{
                 for d in 0...9{
-                    if c==p||d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==f||d==f||c==d{
+                    if c==p||d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==h||d==h||c==d{
                         continue}
                         var ab = ef+c*10+d
                         if ab>99{
@@ -26,7 +26,7 @@ for g in 2...9{
                     
                             var a = ab/10
                             var b = ab%10
-                                if a==p||b==p||a==e||b==e||a==f||b==f||a==g||b==g||a==f||b==f||a==c||b==c||a==d||a==d||a==b{
+                                if a==p||b==p||a==e||b==e||a==f||b==f||a==g||b==g||a==h||b==h||a==c||b==c||a==d||a==d||a==b{
                                     continue}
                                 print("AB \(a)\(b)- CD \(c)\(d) = EF \(e)\(f) +GH \(g)\(h) = \(p)\(p)\(p)")
                     

From ff4d9acaa49eca5e4d81fab84c4d5d4b26e97e8f Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 22:18:23 +0800
Subject: [PATCH 03/11] Update abcdefghppp.swift

should check e is not equal to f
---
 Swift/abcdefghppp.swift | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 21578b0..f093e0f 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -14,6 +14,9 @@ for g in 2...9{
             var ef = (p*100+p*10+p)-(g*10+h)
             var e = ef/10
             var f = ef%10
+           if e==f{
+            continue
+        }
         
         //ef + cd = ab
             for c in 1...9{

From 674246843e42c13655cd31e61ef9aa6418fd3d5a Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 22:28:38 +0800
Subject: [PATCH 04/11] Update abcdefghppp.swift

---
 Swift/abcdefghppp.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index f093e0f..528cb6c 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -25,7 +25,7 @@ for g in 2...9{
                         continue}
                         var ab = ef+c*10+d
                         if ab>99{
-                            continue}
+                            break}
                     
                             var a = ab/10
                             var b = ab%10

From 4f900a02ee3128ad87aceb0f3f591abdd05b7409 Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 22:50:04 +0800
Subject: [PATCH 05/11] Update abcdefghppp.swift

---
 Swift/abcdefghppp.swift | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 528cb6c..3477c3e 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -1,4 +1,5 @@
-//: Tested on Xcode 7.3 Playground
+/ Tested on Xcode 7.3 Playground
+// AB - CD = EF + GH = PPP
 
 import Cocoa
 
@@ -14,14 +15,14 @@ for g in 2...9{
             var ef = (p*100+p*10+p)-(g*10+h)
             var e = ef/10
             var f = ef%10
-           if e==f{
+        if e==f || e==1 || f==1{
             continue
         }
         
         //ef + cd = ab
-            for c in 1...9{
+            for c in 2...9{
                 for d in 0...9{
-                    if c==p||d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==h||d==h||c==d{
+                    if d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==h||d==h||c==d{
                         continue}
                         var ab = ef+c*10+d
                         if ab>99{

From fc7df2ebce7bae4596ac5938eca13b175d8976a1 Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Fri, 25 Mar 2016 22:51:06 +0800
Subject: [PATCH 06/11] Create output.txt

---
 Swift/output.txt | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Swift/output.txt

diff --git a/Swift/output.txt b/Swift/output.txt
new file mode 100644
index 0000000..95bb56f
--- /dev/null
+++ b/Swift/output.txt
@@ -0,0 +1,29 @@
+AB 95- CD 27 = EF 68 +GH 43 = 111
+AB 93- CD 28 = EF 65 +GH 46 = 111
+AB 97- CD 32 = EF 65 +GH 46 = 111
+AB 89- CD 25 = EF 64 +GH 47 = 111
+AB 90- CD 27 = EF 63 +GH 48 = 111
+AB 80- CD 23 = EF 57 +GH 54 = 111
+AB 83- CD 26 = EF 57 +GH 54 = 111
+AB 86- CD 29 = EF 57 +GH 54 = 111
+AB 89- CD 32 = EF 57 +GH 54 = 111
+AB 80- CD 26 = EF 54 +GH 57 = 111
+AB 83- CD 29 = EF 54 +GH 57 = 111
+AB 86- CD 32 = EF 54 +GH 57 = 111
+AB 90- CD 36 = EF 54 +GH 57 = 111
+AB 92- CD 38 = EF 54 +GH 57 = 111
+AB 79- CD 26 = EF 53 +GH 58 = 111
+AB 86- CD 34 = EF 52 +GH 59 = 111
+AB 82- CD 35 = EF 47 +GH 64 = 111
+AB 78- CD 32 = EF 46 +GH 65 = 111
+AB 85- CD 46 = EF 39 +GH 72 = 111
+AB 90- CD 52 = EF 38 +GH 73 = 111
+AB 92- CD 54 = EF 38 +GH 73 = 111
+AB 94- CD 56 = EF 38 +GH 73 = 111
+AB 65- CD 28 = EF 37 +GH 74 = 111
+AB 89- CD 52 = EF 37 +GH 74 = 111
+AB 86- CD 54 = EF 32 +GH 79 = 111
+AB 64- CD 35 = EF 29 +GH 82 = 111
+AB 75- CD 46 = EF 29 +GH 82 = 111
+AB 95- CD 67 = EF 28 +GH 83 = 111
+AB 90- CD 63 = EF 27 +GH 84 = 111

From 478157b5d58e96f5e06f4045342de489b1910df6 Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Sat, 26 Mar 2016 02:12:11 +0800
Subject: [PATCH 07/11] Update abcdefghppp.swift

Mistake fixed - check of EF is not equal of GH
---
 Swift/abcdefghppp.swift | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 3477c3e..270c7ea 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -1,4 +1,4 @@
-/ Tested on Xcode 7.3 Playground
+// Tested on Xcode 7.3 Playground
 // AB - CD = EF + GH = PPP
 
 import Cocoa
@@ -15,7 +15,7 @@ for g in 2...9{
             var ef = (p*100+p*10+p)-(g*10+h)
             var e = ef/10
             var f = ef%10
-        if e==f || e==1 || f==1{
+        if e==f || e==p || f==p || e==g || e==h || f==g || f==h{
             continue
         }
         
@@ -39,3 +39,4 @@ for g in 2...9{
         
     }
 }
+

From 9b84eb83db08dbaf1871ec1bca5982a5fd86dadd Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Sat, 26 Mar 2016 02:12:53 +0800
Subject: [PATCH 08/11] Update output.txt

Correct Output
---
 Swift/output.txt | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/Swift/output.txt b/Swift/output.txt
index 95bb56f..a6bda7c 100644
--- a/Swift/output.txt
+++ b/Swift/output.txt
@@ -2,28 +2,8 @@ AB 95- CD 27 = EF 68 +GH 43 = 111
 AB 93- CD 28 = EF 65 +GH 46 = 111
 AB 97- CD 32 = EF 65 +GH 46 = 111
 AB 89- CD 25 = EF 64 +GH 47 = 111
+AB 95- CD 27 = EF 68 +GH 43 = 111
 AB 90- CD 27 = EF 63 +GH 48 = 111
-AB 80- CD 23 = EF 57 +GH 54 = 111
-AB 83- CD 26 = EF 57 +GH 54 = 111
-AB 86- CD 29 = EF 57 +GH 54 = 111
-AB 89- CD 32 = EF 57 +GH 54 = 111
-AB 80- CD 26 = EF 54 +GH 57 = 111
-AB 83- CD 29 = EF 54 +GH 57 = 111
-AB 86- CD 32 = EF 54 +GH 57 = 111
-AB 90- CD 36 = EF 54 +GH 57 = 111
-AB 92- CD 38 = EF 54 +GH 57 = 111
-AB 79- CD 26 = EF 53 +GH 58 = 111
-AB 86- CD 34 = EF 52 +GH 59 = 111
-AB 82- CD 35 = EF 47 +GH 64 = 111
-AB 78- CD 32 = EF 46 +GH 65 = 111
 AB 85- CD 46 = EF 39 +GH 72 = 111
-AB 90- CD 52 = EF 38 +GH 73 = 111
-AB 92- CD 54 = EF 38 +GH 73 = 111
-AB 94- CD 56 = EF 38 +GH 73 = 111
-AB 65- CD 28 = EF 37 +GH 74 = 111
-AB 89- CD 52 = EF 37 +GH 74 = 111
 AB 86- CD 54 = EF 32 +GH 79 = 111
-AB 64- CD 35 = EF 29 +GH 82 = 111
-AB 75- CD 46 = EF 29 +GH 82 = 111
-AB 95- CD 67 = EF 28 +GH 83 = 111
 AB 90- CD 63 = EF 27 +GH 84 = 111

From 46a768c81554d50122e265034cc73fe91770b62c Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Sat, 26 Mar 2016 02:13:48 +0800
Subject: [PATCH 09/11] Update output.txt

Correct Output
---
 Swift/output.txt | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/Swift/output.txt b/Swift/output.txt
index a6bda7c..fed7d33 100644
--- a/Swift/output.txt
+++ b/Swift/output.txt
@@ -1,8 +1,4 @@
 AB 95- CD 27 = EF 68 +GH 43 = 111
-AB 93- CD 28 = EF 65 +GH 46 = 111
-AB 97- CD 32 = EF 65 +GH 46 = 111
-AB 89- CD 25 = EF 64 +GH 47 = 111
-AB 95- CD 27 = EF 68 +GH 43 = 111
 AB 90- CD 27 = EF 63 +GH 48 = 111
 AB 85- CD 46 = EF 39 +GH 72 = 111
 AB 86- CD 54 = EF 32 +GH 79 = 111

From 2db15d9a416ab8ed756e5923585a522d26c7bb5d Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Sat, 26 Mar 2016 02:24:29 +0800
Subject: [PATCH 10/11] Update abcdefghppp.swift

---
 Swift/abcdefghppp.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 270c7ea..6c09309 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -6,7 +6,7 @@ import Cocoa
 
 var p = 1;
 
-// g start from 1 because no 0 and p=1
+// g start from 2 because no 0 and p=1
 for g in 2...9{
     for h in 0...9{
         if h==p||g==h{

From 4877b4ad8e81f94557669f44ab1c4993a28dfcab Mon Sep 17 00:00:00 2001
From: evec <sai_cheong@hotmail.com>
Date: Sat, 26 Mar 2016 17:32:58 +0800
Subject: [PATCH 11/11] Update abcdefghppp.swift

Change all commit to begin
---
 Swift/abcdefghppp.swift | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/Swift/abcdefghppp.swift b/Swift/abcdefghppp.swift
index 6c09309..528cfdd 100644
--- a/Swift/abcdefghppp.swift
+++ b/Swift/abcdefghppp.swift
@@ -1,17 +1,20 @@
 // Tested on Xcode 7.3 Playground
 // AB - CD = EF + GH = PPP
+// Calcuate based from backward
+// EF = PPP-GH and AB = EF+CD
+
 
 import Cocoa
 
 
 var p = 1;
 
-// g start from 2 because no 0 and p=1
+
 for g in 2...9{
     for h in 0...9{
         if h==p||g==h{
             continue}
-        // ef = 111-gh
+        
             var ef = (p*100+p*10+p)-(g*10+h)
             var e = ef/10
             var f = ef%10
@@ -19,7 +22,7 @@ for g in 2...9{
             continue
         }
         
-        //ef + cd = ab
+    
             for c in 2...9{
                 for d in 0...9{
                     if d==p||c==e||d==e||c==f||d==f||c==g||d==g||c==h||d==h||c==d{