sudoku-solver (#144)

README.md

@@ -11,6 +11,7 @@ So far, the following projects have been integrated to this repo:
 
 | Project Name | Contributors |
 |--|--|
+| [sudoku-solver](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/sudoku-solver) | [Rishabh Umrao](https://github.com/ayedaemon)  |
 |[File Encrypt Decrypt](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/file-encrypt-decrypt)|[Aditya Arakeri](https://github.com/adityaarakeri)|
 | [Address locator](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/Location_Of_Adress) | [Chris]() |
 | [Automated emails](https://github.com/hastagAB/Awesome-Python-Scripts/tree/master/automated_email) | [Suvigya](https://github.com/SuvigyaJain1) |

sudoku-solver/app.py

@@ -0,0 +1,21 @@
+from sudoku_solver.solver import *
+
+x =    [[8, 1, 0, 0, 3, 0, 0, 2, 7],
+        [0, 6, 2, 0, 5, 0, 0, 9, 0],
+        [0, 7, 0, 0, 0, 0, 0, 0, 0],
+        [0, 9, 0, 6, 0, 0, 1, 0, 0],
+        [1, 0, 0, 0, 2, 0, 0, 0, 4],
+        [0, 0, 8, 0, 0, 5, 0, 7, 0],
+        [0, 0, 0, 0, 0, 0, 0, 8, 0],
+        [0, 2, 0, 0, 1, 0, 7, 5, 0],
+        [3, 8, 0, 0, 7, 0, 0, 4, 2]]
+
+
+
+
+if __name__ == "__main__":
+    print("INPUT => ")
+    printsudoku(x)
+    solveSudoku(x)
+    print("OUTPUT => ")
+    printsudoku(x)

sudoku-solver/readme.md

@@ -0,0 +1,65 @@
+# sudoku-solver
+
+This is a script to solve 9x9 sudoku matrix using python.
+
+### How to use it?
+
+1. edit app.py to add your sudoku matrix. (Fill `0` for empty cells.)
+
+```
+For example,
+
+[[8, 1, 0, 0, 3, 0, 0, 2, 7],
+[0, 6, 2, 0, 5, 0, 0, 9, 0],
+[0, 7, 0, 0, 0, 0, 0, 0, 0],
+[0, 9, 0, 6, 0, 0, 1, 0, 0],
+[1, 0, 0, 0, 2, 0, 0, 0, 4],
+[0, 0, 8, 0, 0, 5, 0, 7, 0],
+[0, 0, 0, 0, 0, 0, 0, 8, 0],
+[0, 2, 0, 0, 1, 0, 7, 5, 0],
+[3, 8, 0, 0, 7, 0, 0, 4, 2]]
+```
+
+2.  run the script.
+
+```
+python3 app.py
+```
+
+3. This will give you output on the console. Output will contain the input sudoku matrix and the solved sudoku matrix.
+
+```
+INPUT =>
+
+
+
+8 1 0 | 0 3 0 | 0 2 7
+0 6 2 | 0 5 0 | 0 9 0
+0 7 0 | 0 0 0 | 0 0 0
+---------------------
+0 9 0 | 6 0 0 | 1 0 0
+1 0 0 | 0 2 0 | 0 0 4
+0 0 8 | 0 0 5 | 0 7 0
+---------------------
+0 0 0 | 0 0 0 | 0 8 0
+0 2 0 | 0 1 0 | 7 5 0
+3 8 0 | 0 7 0 | 0 4 2
+
+
+
+OUTPUT =>
+
+
+
+8 1 9 | 4 3 6 | 5 2 7
+4 6 2 | 7 5 1 | 3 9 8
+5 7 3 | 2 9 8 | 4 1 6
+---------------------
+2 9 4 | 6 8 7 | 1 3 5
+1 5 7 | 9 2 3 | 8 6 4
+6 3 8 | 1 4 5 | 2 7 9
+---------------------
+7 4 5 | 3 6 2 | 9 8 1
+9 2 6 | 8 1 4 | 7 5 3
+3 8 1 | 5 7 9 | 6 4 2
+```

sudoku-solver/sudoku_solver/solver.py

@@ -0,0 +1,44 @@
+def printsudoku(sudoku):
+    print("\n\n")
+    for i in range(len(sudoku)):
+        line = ""
+        if i == 3 or i == 6:
+            print("---------------------")
+        for j in range(len(sudoku[i])):
+            if j == 3 or j == 6:
+                line += "| "
+            line += str(sudoku[i][j])+" "
+        print(line)
+    print("\n\n")
+
+def findNextCellToFill(sudoku):
+    for x in range(9):
+        for y in range(9):
+            if sudoku[x][y] == 0:
+                return x, y
+    return -1, -1
+
+def isValid(sudoku, i, j, e):
+    rowOk = all([e != sudoku[i][x] for x in range(9)])
+    if rowOk:
+        columnOk = all([e != sudoku[x][j] for x in range(9)])
+        if columnOk:
+            secTopX, secTopY = 3*(i//3), 3*(j//3)
+            for x in range(secTopX, secTopX+3):
+                for y in range(secTopY, secTopY+3):
+                    if sudoku[x][y] == e:
+                        return False
+            return True
+    return False
+
+def solveSudoku(sudoku, i=0, j=0):
+    i, j = findNextCellToFill(sudoku)
+    if i == -1:
+        return True
+    for e in range(1, 10):
+        if isValid(sudoku, i, j, e):
+            sudoku[i][j] = e
+            if solveSudoku(sudoku, i, j):
+                return True
+            sudoku[i][j] = 0
+    return False