ExpNo 8 : Solve Cryptarithmetic Problem,a CSP(Constraint Satisfaction Problem) using Python

Name: Dhinesh R

Register Number: 212223220019

Aim:

To solve Cryptarithmetic Problem,a CSP(Constraint Satisfaction Problem) using Python

Procedure:

Input and Output
Input: This algorithm will take three words.
B A S E
B A L L
----------
G A M E S

Output: It will show which letter holds which number from 0 – 9. For this case it is like this.

          B A S E                         2 4 6 1
          B A L L                         2 4 5 5
         ---------                       ---------
        G A M E S                       0 4 9 1 6

Algorithm For this problem, we will define a node, which contains a letter and its corresponding values.

isValid(nodeList, count, word1, word2, word3)

Input − A list of nodes, the number of elements in the node list and three words.

Output − True if the sum of the value for word1 and word2 is same as word3 value.

Begin
m := 1
for each letter i from right to left of word1, do
ch := word1[i]
for all elements j in the nodeList, do
if nodeList[j].letter = ch, then
break
done
val1 := val1 + (m * nodeList[j].value)
m := m * 10
done

m := 1
for each letter i from right to left of word2, do
ch := word2[i]
for all elements j in the nodeList, do
if nodeList[j].letter = ch, then
break
done

  val2 := val2 + (m * nodeList[j].value)
  m := m * 10

done

m := 1
for each letter i from right to left of word3, do
ch := word3[i]
for all elements j in the nodeList, do
if nodeList[j].letter = ch, then
break
done

  val3 := val3 + (m * nodeList[j].value)
  m := m * 10

done

if val3 = (val1 + val2), then
return true
return false
End

PROGRAM :

from itertools import permutations

def solve_cryptarithmetic():
for perm in permutations(range(10), 8):
    S, E, N, D, M, O, R, Y = perm

    # Check for leading zeros
    if S == 0 or M == 0:
        continue

    # Check the equation constraints
    SEND = 1000 * S + 100 * E + 10 * N + D
    MORE = 1000 * M + 100 * O + 10 * R + E
    MONEY = 10000 * M + 1000 * O + 100 * N + 10 * E + Y

    if SEND + MORE == MONEY:
        return SEND, MORE, MONEY

return None

   solution = solve_cryptarithmetic()

 if solution:
    SEND, MORE, MONEY = solution
    print(f'SEND = {SEND}')
    print(f'MORE = {MORE}')
    print(f'MONEY = {MONEY}')
 else:
   print("No solution found.")
```

Sample Input and Output:

SEND = 9567
MORE = 1085

MONEY = 10652

Result:

Thus a Cryptarithmetic Problem was solved using Python successfully

Dhinesh2301 / 19AI405ExpNo8