2020-04
20

更爽

By xrspook @ 12:00:26 归类于: 扮IT

战胜参考答案从昨晚开始貌似就成了我最大的快乐。互锁词的生成要比昨天的回文词复杂一些,因为这意味着搜索的次数更多了。虽然都是用二分法搜索的思路,但我就是要比参考答案快接近30倍肿么破。至于为什么会这样,我没有研究,或许我应该仔细研究一下。

10万条的单词表里:二词互锁1254条,我用时1.4秒,参考答案用时39.1秒;三词互锁991条,我用时1.5秒,参考答案用时43.4秒。一箩筐的成就感啊啊啊啊啊啊啊~~~

Exercise 12: Two words “interlock” if taking alternating letters from each forms a new word. For example, “shoe” and “cold” interlock to form “schooled”. Solution: http://thinkpython2.com/code/interlock.py. Credit: This exercise is inspired by an example at http://puzzlers.org. Write a program that finds all pairs of words that interlock. Hint: don’t enumerate all pairs! Can you find any words that are three-way interlocked; that is, every third letter forms a word, starting from the first, second or third?

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import time
def in_bisect(library, first, last, myword): # 二分法搜索,10万数据查询最多只需不到20步
    if first > last: # 这是一句拯救了我的条件
        return -1
    else:
        mid = (first + last)//2
        if myword == library[mid]:
            return mid
        elif library[mid] > myword:
            return in_bisect(library, first, mid-1, myword)
        else:
            return in_bisect(library, mid+1, last, myword)
def interlock(library, i, num):
    m = 0
    n = num
    while m < num:
        if in_bisect(library, 0, len(library)-1, library[i][m::n]) == -1:
            return False
        else:
            m += 1
            n -+ 1
    return True
count = 0
library = []
fin = open('words.txt')
for line in fin:
    word = line.strip()
    library.append(word)
library.sort()
start = time.time()
# for i in range(len(library)-1): # 二词互锁
#     if interlock(library, i, 2):
#         print(library[i], library[i][::2], library[i][1::2])
#         count += 1
for i in range(len(library)-1): # 三词互锁
    if interlock(library, i, 3):
        print(library[i], library[i][::3], library[i][1::3], library[i][2::3])
        count += 1
print(count)
end = time.time()
print(end - start)
# 1254, 1.3558001518249512 # 二词互锁 xrspook解法
# 1254, 39.10080027580261  # 二词互锁 参考答案
# 991, 1.4504001140594482  # 三词互锁 xrspook解法
# 991, 43.366000175476074  # 三次互锁 参考答案

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