2 files changed, 26 insertions, 15 deletions
diff --git a/challenge-250/eric-cheung/python/ch-1.py b/challenge-250/eric-cheung/python/ch-1.py
index 3f0e3c37c1..66f88a07e9 100755
--- a/challenge-250/eric-cheung/python/ch-1.py
+++ b/challenge-250/eric-cheung/python/ch-1.py
@@ -1,10 +1,17 @@
 
-## arrInt = [0, 1, 2]  ## Example 1
-## arrInt = [4, 3, 2, 1]  ## Example 2
-arrInt = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]  ## Example 3
-
-arrOutput = [nIndx for nIndx in range(len(arrInt)) if nIndx % 10 == arrInt[nIndx]]
-if len(arrOutput) > 0:
-    print (arrOutput[0])
-else:
-    print (-1)
+## arrInt = [6, 12, 25, 1]  ## Example 1
+## arrInt = [10, 7, 31, 5, 2, 2]  ## Example 2
+arrInt = [1, 2, 10]  ## Example 3
+
+nSum = 0
+while len(arrInt) > 0:
+    if len(arrInt) == 1:
+        nSum = nSum + arrInt[0]
+        del arrInt[0]
+    else:
+        nSum = nSum + int(str(arrInt[0]) + str(arrInt[-1]))
+        del arrInt[-1]
+        del arrInt[0]
+
+print (nSum)
+
diff --git a/challenge-250/eric-cheung/python/ch-2.py b/challenge-250/eric-cheung/python/ch-2.py
index 43a7617ff9..a659fab6a6 100755
--- a/challenge-250/eric-cheung/python/ch-2.py
+++ b/challenge-250/eric-cheung/python/ch-2.py
@@ -1,9 +1,13 @@
 
-def GetAlphaNumLen (strInput):
-    return int(strInput) if strInput.isnumeric() else len(strInput)
+## Remarks
+## https://github.com/doocs/leetcode/blob/main/solution/1300-1399/1380.Lucky%20Numbers%20in%20a%20Matrix/README_EN.md
 
-## arrAlphaNumStr = ["perl", "2", "000", "python", "r4ku"]  ## Example 1
-arrAlphaNumStr = ["001", "1", "000", "0001"]  ## Example 2
+## arrMatrix = [[3, 7, 8], [9, 11, 13], [15, 16, 17]]  ## Example 1
+## arrMatrix = [[1, 10, 4, 2], [9, 3, 8, 7], [15, 16, 17, 12]]  ## Example 2
+arrMatrix = [[7, 8], [1, 2]]  ## Example 3
 
-arrOutput = [GetAlphaNumLen(strLoop) for strLoop in arrAlphaNumStr]
-print (max(arrOutput))
+setRowMin = {min(rowLoop) for rowLoop in arrMatrix}
+setColMax = {max(colLoop) for colLoop in zip(*arrMatrix)}
+
+arrLuckyNum = list(setRowMin & setColMax)  ## Intersection of Two Sets
+print (arrLuckyNum if len(arrLuckyNum) > 0 else -1)