2 files changed, 98 insertions, 0 deletions
diff --git a/challenge-099/paulo-custodio/python/ch-1.py b/challenge-099/paulo-custodio/python/ch-1.py
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+++ b/challenge-099/paulo-custodio/python/ch-1.py
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+#!/usr/bin/env python
+
+# Challenge 099
+# 
+# TASK #1 > Pattern Match
+# Submitted by: Mohammad S Anwar
+# You are given a string $S and a pattern $P.
+#
+# Write a script to check if given pattern validate the entire string.
+# Print 1 if pass otherwise 0.
+#
+# The patterns can also have the following characters:
+#
+# ? - Match any single character.
+# * - Match any sequence of characters.
+# Example 1:
+# Input: $S = "abcde" $P = "a*e"
+# Output: 1
+# Example 2:
+# Input: $S = "abcde" $P = "a*d"
+# Output: 0
+# Example 3:
+# Input: $S = "abcde" $P = "?b*d"
+# Output: 0
+# Example 4:
+# Input: $S = "abcde" $P = "a*c?e"
+# Output: 1
+
+import sys
+
+def match(s, p):
+    while True:
+        if s=="" and p=="":
+            return True
+        elif s=="" or p=="":
+            return False
+        elif p[0]=="?":
+            s=s[1:]
+            p=p[1:]
+        elif p[0]=="*":
+            p=p[1:]
+            for i in range(0, len(s)):
+                if match(s[i:], p):
+                    return True
+            return False
+        elif s[0]!=p[0]:
+            return False
+        else:
+            s=s[1:]
+            p=p[1:]
+
+if match(sys.argv[1], sys.argv[2]):
+    print(1)
+else:
+    print(0)
diff --git a/challenge-099/paulo-custodio/python/ch-2.py b/challenge-099/paulo-custodio/python/ch-2.py
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+++ b/challenge-099/paulo-custodio/python/ch-2.py
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+#!/usr/bin/env python
+
+# Challenge 099
+# 
+# TASK #2 > Unique Sub-sequence
+# Submitted by : Mohammad S Anwar
+# You are given two strings $S and $T.
+#
+# Write a script to find out count of different unique sub-sequences matching
+# $T without changing the position of characters.
+#
+# Example 1:
+# Input : $S = "littleit', $T = 'lit'
+# Output : 5
+#
+#     1: [lit] tleit
+#     2: [li] t[t] leit
+#     3: [li] ttlei[t]
+#     4: litt[l] e[it]
+#     5: [l] ittle[it]
+# Example 2:
+# Input : $S = "london', $T = 'lon'
+# Output : 3
+#
+#     1: [lon] don
+#     2: [lo] ndo[n]
+#     3: [l] ond[on]
+
+import sys
+
+def count_subsequences(s, t):
+    while True:
+        if t=="":
+            return 1
+        elif s=="":
+            return 0
+        elif s[0]==t[0]:
+            return (count_subsequences(s[1:], t[1:]) +
+                    count_subsequences(s[1:], t))
+        else:
+            s=s[1:]
+
+print(count_subsequences(sys.argv[1], sys.argv[2]))