2 files changed, 33 insertions, 0 deletions
diff --git a/challenge-280/eric-cheung/python/ch-1.py b/challenge-280/eric-cheung/python/ch-1.py
new file mode 100755
index 0000000000..df33741859
--- /dev/null
+++ b/challenge-280/eric-cheung/python/ch-1.py
@@ -0,0 +1,19 @@
+
+## Ref.
+## https://leetcode.com/problems/first-letter-to-appear-twice/description/
+## https://medium.com/@ac.shreedhar/2351-first-letter-to-appear-twice-in-java-970f99e3f625
+## https://algo.monster/liteproblems/2351
+
+def GetFirstAppearTwice (strFunc):
+    arrResult = [strFunc[0]]
+    for nIndx in range(1, len(strFunc)):
+        if strFunc[nIndx] in arrResult:
+            return strFunc[nIndx]
+        arrResult.append(strFunc[nIndx])
+    return ""
+
+## strInput = "acbddbca"  ## Example 1
+## strInput = "abccd"  ## Example 2
+strInput = "abcdabbb"  ## Example 3
+
+print (GetFirstAppearTwice (strInput))
diff --git a/challenge-280/eric-cheung/python/ch-2.py b/challenge-280/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..d7bbc31000
--- /dev/null
+++ b/challenge-280/eric-cheung/python/ch-2.py
@@ -0,0 +1,14 @@
+
+## Ref.
+## https://leetcode.ca/2022-07-26-2315-Count-Asterisks/
+
+## strInput = "p|*e*rl|w**e|*ekly|"  ## Example 1
+## strInput = "perl"  ## Example 2
+strInput = "th|ewe|e**|k|l***ych|alleng|e"  ## Example 3
+
+if strInput.count("|") < 2:
+    print (strInput.count("*"))
+else:
+    arrSplit = strInput.split("|")
+    strResult = "".join([arrSplit[nIndx] for nIndx in range(len(arrSplit)) if nIndx % 2 == 0])
+    print (strResult.count("*"))