2021.04.09

seulchan/open_chat.py

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+# https://programmers.co.kr/learn/courses/30/lessons/42888#
+# 오픈채팅방
+'''
+input: list[Enter/Leave/Change, user_id, nickname]
+output: list
+
+change nickname
+- leave + enter
+- change
+
+# solution; loop once, make dict
+
+loop record
+create template
+if command is enter:
+	append dict if not exist
+    change dict if different
+    append message (using template)
+if command is chagne
+	change to dict
+if command is leave;
+    append message
+    
+return message from template
+
+-> O(n) + O(n) => O(n)
+
+# 
+'''
+import string
+def solution(record):
+    answer = []
+    tmps = []
+    d = {}
+    for r in record:
+        command, uid, *nickname = r.split(' ')
+        if command in {'Enter', 'Leave'}:
+            tmps.append((command, uid))
+        if command in {'Enter', 'Change'}:
+            d[uid] = nickname[0]
+
+    for tmp in tmps:
+        if tmp[0] == 'Enter':
+            m = f'{d[tmp[1]]}님이 들어왔습니다.'
+        else:
+            m = f'{d[tmp[1]]}님이 나갔습니다.'
+        answer.append(m)
+    return answer
+
+    # python string.Template 사용시 에러나서 다시
+    # 왜 에러나는지 모르겠음
+    '''
+    answer = []
+    d = {}  # user_id: nickname
+    for r in record:
+        command, uid, *nickname = r.split(' ')
+        r = r.split()
+        command, uid = r[0], r[1]
+        if command in {'Enter', 'Leave'}:
+            if command == 'Enter':
+                m = f'${uid}님이 들어왔습니다.'
+            else:
+                m = f'${uid}님이 나갔습니다.'
+            answer.append(string.Template(m))
+        if command in {'Enter', 'Change'}:
+            d[uid] = r[2]
+            
+    return [x.substitute(d) for x in answer]
+    '''