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Author: Albert-learner

Day10/SizerCode.py

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+# 19.  시저 암호
+
+def solution(s, n):
+    answer = ''
+
+    for char in s:
+        if char.isalpha():
+            if 65 <= ord(char) <= 90:
+                if ord(char) + n > 90:
+                    answer += chr(ord(char) - 26 + n)
+                else:
+                    answer += chr(ord(char) + n)
+            else:
+                if ord(char) + n > 122:
+                    answer += chr(ord(char) - 26 + n)
+                else:
+                    answer += chr(ord(char) + n)
+        else:
+            answer += ' '
+    return answer
+
+s_1 = 'AB'
+s_2 = 'z'
+s_3 = 'a B z'
+
+n_1 = 1
+n_2 = 1
+n_3 = 4
+
+print(solution(s_1, n_1))
+print(solution(s_2, n_2))
+print(solution(s_3, n_3))
+
+def solution_best(s, n):
+    answer = ''
+    str = list(s)
+    for i in range(len(str)):
+        if str[i].isupper():
+            str[i] = chr((ord(str[i]) - ord('A') + n) % 26 + ord('A'))
+        elif str[i].islower():
+            str[i] = chr((ord(str[i]) - ord('a') + n) % 26 + ord('a'))
+
+    answer = ''.join(str)
+    return answer
+
+print(solution_best(s_1, n_1))
+print(solution_best(s_2, n_2))
+print(solution_best(s_3, n_3))
+# 틀린 풀이
+def solution_error(s, n):
+    answer = ''
+
+    # string을 ascii로 바꾼 리스트
+    str_ascii_lst = [ord(i) for i in s]
+    # print(str_ascii_lst)
+
+    for idx, cost in enumerate(str_ascii_lst):
+        if cost == 32:
+            str_ascii_lst[idx] -= 4
+        str_ascii_lst[idx] += n
+
+    # print(str_ascii_lst)
+    for i in str_ascii_lst:
+        idx = str_ascii_lst.index(i)
+        if 90 < i and i < 97:
+            rest = i - 90
+            str_ascii_lst[idx] = 64 + rest
+        elif 122 < i:
+            rest = i - 122
+            str_ascii_lst[idx] = 96 + rest
+
+    answer = ''.join(chr(i) for i in str_ascii_lst)
+    return answer

Day10/TransposeTernaryNumeralSystem.py

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+# 41. 삼진법 뒤집기
+
+# 어디가 틀린거지??? 내 풀이 ㅠㅠ
+def solution(n):
+    answer = 0
+
+    Ternary_str = ''
+    while n > 0:
+        Ternary_str += str(n % 3)
+        n //= 3
+
+    cnt = 1
+    for each_chr in reversed(Ternary_str):
+        answer += cnt * int(each_chr)
+        cnt *= 3
+
+    return answer
+
+n_1 = 45
+n_2 = 125
+
+print(solution(n_1))
+print(solution(n_2))
+
+def solution_error(n):
+    answer = 0
+
+    # 3진법 문자열 -> '1200'
+    Ternary_str = ''
+
+    quota, rest = n // 3, n % 3
+    Ternary_str += str(rest)
+
+    if n != 1:
+        # 45 -> '1200' -> '0021'
+        while quota > 3:
+            rest = quota % 3
+            quota //= 3
+            Ternary_str += str(rest)
+        Ternary_str += str(quota)
+
+    # 10진법 리스트 ... '0021' -> [0, 0, 2, 1]
+    Decimal_lst = [int(i) for i in Ternary_str]
+
+    for i in range(len(Decimal_lst)):
+        answer += Decimal_lst[i] * (3 ** (len(Decimal_lst) - i - 1))
+    return answer
+
+# print(solution_error(n_1))
+# print(solution_error(n_2))