Squash commit

utilities/is_subsequence.py

@@ -0,0 +1,13 @@
+def is_subsequence(s, t):
+    """
+    :type s: str
+    :type t: str
+    :rtype: bool
+    """
+    if len(s) > len(t):
+        return False
+    matched_s = 0
+    for char in t:
+        if matched_s < len(s) and s[matched_s] == char:
+            matched_s += 1
+    return matched_s == len(s)