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按字典顺序排列是什么意思,怎么理解的?
```python
def calculate_combinations():
# 初始化一个列表,用于存储所有字母组合
combinations = []
# 循环遍历长度从1到6的所有字母组合
for length in range(1, 7):
for char1 in range(ord('a'), ord('z') - length + 2):
combination = chr(char1)
if length > 1:
for char2 in range(char1 + 1, ord('z') - length + 3):
combination += chr(char2)
if length > 2:
for char3 in range(char2 + 1, ord('z') - length + 4):
combination += chr(char3)
if length > 3:
for char4 in range(char3 + 1, ord('z') - length + 5):
combination += chr(char4)
if length > 4:
for char5 in range(char4 + 1, ord('z') - length + 6):
combination += chr(char5)
if length > 5:
for char6 in range(char5 + 1, ord('z') - length + 7):
combination += chr(char6)
combinations.append(combination)
combination = combination[:-1]
else:
combinations.append(combination)
combination = combination[:-1]
else:
combinations.append(combination)
combination = combination[:-1]
else:
combinations.append(combination)
combination = combination[:-1]
else:
combinations.append(combination)
combination = combination[:-1]
else:
combinations.append(combination)
return combinations
def find_word_encoding(word, combinations):
# 在字母组合列表中查找给定单词
if word in combinations:
return combinations.index(word) + 1
else:
return 0
# 输入被编码的单词
word = input().strip()
# 计算字母组合
combinations = calculate_combinations()
# 查找单词的编码并输出结果
encoding = find_word_encoding(word, combinations)
print(encoding)
```
from string import ascii_lowercase
def calculate_combinations(arr_temp):
# 长度大于6
if len(arr_temp) > 6:
return '0'
else:
# 是不是字母升序排列
t = arr_temp.copy()
t.sort()
if t != arr_temp:
return '0'
else:
# 计算最终结果
result = 0
for alpaha,num in zip( arr_temp,range(len(arr_temp),0,-1) ):
result += info_dict.get(alpaha) * pow(26,num-1)
return result - 1
#用户输入,全部转换成小写字母
arr_temp = [item.lower() for item in input().strip() ]
##生成字典
info_dict = dict( zip( ascii_lowercase,range(1,27) ) )
result = calculate_combinations(arr_temp)
print(result)
public class Encoding {
public static void main(String[] args) {
String word = "ab";
System.out.println(getEncoding(word));
}
public static boolean isValid(String word) {
if (word.length() > 6) {
return false;
}
for (int i = 0; i < word.length() - 1; i++) {
if (word.charAt(i) >= word.charAt(i + 1)) {
return false;
}
}
return true;
}
public static int countWordsOfLength(int length) {
return 26 * (26 - 1) / 2 * (26 - length + 1);
}
public static int getWordPosition(String word) {
int position = 0;
for (int i = 0; i < word.length(); i++) {
position += word.charAt(i) - 'a' - i;
}
return position;
}
public static int getEncoding(String word) {
if (!isValid(word)) {
return 0;
}
int encoding = 0;
for (int i = 1; i < word.length(); i++) {
encoding += countWordsOfLength(i);
}
encoding += getWordPosition(word) + 1;
return encoding;
}
}
1.首先检查给定单词是否符合规则(长度不超过6且字母按升序排列)。
2.对于长度为k的单词,计算前k-1长度的所有单词数量。
3.计算给定单词在长度为k的单词中的位置。
4.将步骤2和步骤3的结果相加,得到最终编码。
class Solution:
def __init__(self):
pass
def calculate_combinations(self, n, k):
# 计算组合数
if k > n:
return 0
combinations = [[0] * (k + 1) for _ in range(n + 1)]
for i in range(n + 1):
for j in range(min(i, k) + 1):
if j == 0 or j == i:
combinations[i][j] = 1
else:
combinations[i][j] = combinations[i - 1][j - 1] + combinations[i - 1][j]
return combinations[n][k]
def solution(self, str0):
if len(str0) > 6 or str0 != ''.join(sorted(str0)):
return '0'
else:
str_ = 'abcdefghijklmnopqrstuvwxyz'
dict_ = {str_[v]: v for v in range(26)}
count_with_length = [self.calculate_combinations(26, i) for i in range(6)]
count_with_length[0] = 0
len_ = len(str0)
code_str0 = sum(count_with_length[0:len_])
for i in range(len_):
value = dict_[str0[i]]
while value > 0:
value -= 1
code_str0 += self.calculate_combinations(26 - i, len_ - i - 1)
return code_str0
if __name__ == "__main__":
arr_temp = [item for item in input().strip().split()]
str0 = arr_temp[0]
sol = Solution()
result = sol.solution(str0)
print(result)
求解