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Minimum cost for transformation from one string to another using basic operations

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This commit is contained in:
Daniel Ingram 2018-03-20 18:49:47 -04:00
parent a753acf1de
commit 6abab54c2b
1 changed files with 7 additions and 8 deletions
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15
strings/min-cost-string-conversion.py
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@ -5,7 +5,6 @@ try:
except NameError: except NameError:
xrange = range #Python 3 xrange = range #Python 3
def compute_transform_tables(X, Y, cC, cR, cD, cI):
''' '''
Algorithm for calculating the most cost-efficient sequence for converting one string into another. Algorithm for calculating the most cost-efficient sequence for converting one string into another.
The only allowed operations are The only allowed operations are
@ -14,6 +13,7 @@ The only allowed operations are
---Delete character with cost cD ---Delete character with cost cD
---Insert character with cost cI ---Insert character with cost cI
''' '''
def compute_transform_tables(X, Y, cC, cR, cD, cI):
X = list(X) X = list(X)
Y = list(Y) Y = list(Y)
m = len(X) m = len(X)
@ -81,13 +81,13 @@ if __name__ == '__main__':
i = 0 i = 0
cost = 0 cost = 0
for op in sequence: for op in sequence:
print ''.join(string) print(''.join(string))
if op[0] == 'C': if op[0] == 'C':
file.write('%-16s' % 'Copy %c' % op[1]) file.write('%-16s' % 'Copy %c' % op[1])
file.write('\t\t\t' + ''.join(string)) file.write('\t\t\t' + ''.join(string))
file.write('\r\n') file.write('\r\n')
i += 1
cost -= 1 cost -= 1
elif op[0] == 'R': elif op[0] == 'R':
string[i] = op[2] string[i] = op[2]
@ -96,7 +96,6 @@ if __name__ == '__main__':
file.write('\t\t' + ''.join(string)) file.write('\t\t' + ''.join(string))
file.write('\r\n') file.write('\r\n')
i += 1
cost += 1 cost += 1
elif op[0] == 'D': elif op[0] == 'D':
string.pop(i) string.pop(i)
@ -105,7 +104,6 @@ if __name__ == '__main__':
file.write('\t\t\t' + ''.join(string)) file.write('\t\t\t' + ''.join(string))
file.write('\r\n') file.write('\r\n')
i += 1
cost += 2 cost += 2
else: else:
string.insert(i, op[1]) string.insert(i, op[1])
@ -114,11 +112,12 @@ if __name__ == '__main__':
file.write('\t\t\t' + ''.join(string)) file.write('\t\t\t' + ''.join(string))
file.write('\r\n') file.write('\r\n')
i += 1
cost += 2 cost += 2
print ''.join(string) i += 1
print 'Cost: ', cost
print(''.join(string))
print('Cost: ', cost)
file.write('\r\nMinimum cost: ' + str(cost)) file.write('\r\nMinimum cost: ' + str(cost))
file.close() file.close()