「世界で闘うプログラミング力を鍛える本」Pythonコード解答例 - 1.4 回文の順列

#目次
###CHAP1. 配列と文字列

#Pythonコード解答例

def isPermutationOfPalindrome(phrase):

    phrase = phrase.lower()
    table = buildCharFrequencyTable(phrase)
    return checkMaxOneOdd(table)

def checkMaxOneOdd(table):
    
    foundOdd = False

    for count in range(len(table)):
        if table[count]%2 == 1:
            if foundOdd:
                return False
            foundOdd = True

    return True 

def getCharNumber(c):

    a = ord("a")
    z = ord("z")
    val = ord(c)

    if a <= val and val <= z:
        return val - a
    
    return -1

def buildCharFrequencyTable(phrase):
    
    table = [0] * 26

    for id in range(len(phrase)):
        c = phrase[id]
        x = getCharNumber(c)

        if x != -1 :
            table[x] = table[x] + 1
    
    return table

print(isPermutationOfPalindrome("Tact Coa"))