Just for fun:-) On my ooold PC, it takes 0.047 seconds to run the following
algorithm on the problem 'SNED + MORE == MONEY".
-----------------------------
import time
import itertools
#S, E, N, D, M, O, R, Y
n = 0
digits = {x for x in range(10)}
def tenThousand(u, Cin): # Cin == M
global n
if Cin == M:
print(S, E, N, D, '+', M, O, R, E, '==', M, O, N, E, Y)
n += 1
def thousand(u, Cin): # Cin + S + M == 10 * Cout + O
global S, M, n
rest = digits - set(u)
for g in itertools.permutations(rest, 2):
for Cout in range(2):
if Cin + g[0] + g[1] == 10 * Cout + O:
S = g[0]; M = g[1]
tenThousand(u + g, Cout)
def hundred(u, Cin): # Cin + E + O == 10 * Cout + N
global O, n
rest = digits - set(u)
for g in itertools.permutations(rest, 1):
for Cout in range(2):
if Cin + E + g[0] == 10 * Cout + N:
O = g[0]
thousand(u + g, Cout)
def ten(u, Cin): # Cin + N + R == 10 * Cout + E
global N, R, n
rest = digits - set(u)
for g in itertools.permutations(rest, 2):
for Cout in range(2):
if Cin + g[0] + g[1] == 10 * Cout + E:
N = g[0]; R = g[1]
hundred(u + g, Cout)
def unit(): # D + E == 10 * Cout + Y
global D, E, Y, n
n = 0
for g in itertools.permutations(range(10), 3): # g is a tuple
for Cout in range(2): # add two items so Cout is 0 or 1
if g[0] + g[1] == 10 * Cout + g[2]:
D = g[0]; E = g[1]; Y = g[2]
ten(g, Cout)
print(n)
if __name__ == '__main__':
start = time.time()
unit()
print(time.time() - start)
-------------------------
--Jach
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