[D2] Title: Base64 Decoder, Time: 61 ms, Memory: 53,504 KB -BaekjoonHub

Author: wlsgur11

SWEA/D2/1928. Base64 Decoder/Base64 Decoder.py

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+T = int(input())
+
+# Base64 표준 문자 매핑
+base64_chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
+
+for tc in range(1, T+1):
+    encoded = input()
+    
+    # 패딩 문자 제거
+    padding_count = encoded.count('=')
+    encoded = encoded.rstrip('=')
+    
+    # 이진수로 변환
+    binary = ''
+    for char in encoded:
+        if char in base64_chars:
+            binary += bin(base64_chars.index(char))[2:].zfill(6)
+    
+    # 패딩 비트 제거
+    if padding_count > 0:
+        binary = binary[:-padding_count*2]
+    
+    # 8비트씩 묶어서 ASCII 문자로 변환
+    result = ''
+    for i in range(0, len(binary), 8):
+        if i + 8 <= len(binary):
+            byte = binary[i:i+8]
+            result += chr(int(byte, 2))
+    
+    print(f"#{tc} {result}")

SWEA/D2/1928. Base64 Decoder/README.md

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+# [D2] Base64 Decoder - 1928 
+
+[문제 링크](https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AV5PR4DKAG0DFAUq) 
+
+### 성능 요약
+
+메모리: 53,504 KB, 시간: 61 ms, 코드길이: 769 Bytes
+
+### 제출 일자
+
+2025-05-23 13:18
+
+
+
+> 출처: SW Expert Academy, https://swexpertacademy.com/main/code/problem/problemList.do