remove 38 Count and Say

README.md

@@ -23,6 +23,7 @@
 * 014. [Longest Common Prefix](String/14_LongestCommonPrefix.py)
 * 017. [Letter Combinations of a Phone Number](String/17_LetterCombinationsPN.py)
 * 028. [Implement strStr()](String/28_ImplementstrStr.py)
+* 038. [Count and Say](String/38_CountAndSay.py)
 * 058. [Length of Last Word](String/58_LengthOfLastWord.py)
 * 067. [Add Binary](String/67_AddBinary.py)
 * 068. Text Justification

String/38_CountAndSay.cpp

@@ -0,0 +1,35 @@
+/*
+ * @Author: [email protected]
+ * @Last Modified time: 2016-07-14 19:12:37
+ */
+
+class Solution {
+public:
+    string countAndSay(int n) {
+        int index = 2;
+        string pre_str = "1";
+        while(index <= n){
+            string new_str = "";
+            int i=0;
+            while(i < pre_str.size()){
+                int count = 1;
+                char c = pre_str[i];
+                i += 1;
+                while(i < pre_str.size() && pre_str[i]==c){
+                    count++;
+                    i++;
+                }
+                new_str += to_string(count) + c;
+            }
+            pre_str = new_str;
+            index ++;
+        }
+        return pre_str;
+    }
+};
+
+/*
+1
+5
+15
+*/

Week05/38.py → String/38_CountAndSay.py

@@ -3,11 +3,12 @@
 
 
 class Solution(object):
+    """ Quite straight-forward solution.
+
+    We generate k-th string, and from k-th string we generate k+1-th string,
+    until we generate n-th string.
+    """
     def countAndSay(self, n):
-        """
-        :type n: int
-        :rtype: str
-        """
         if n <= 1:
             return "1"
 
@@ -16,23 +17,26 @@ def countAndSay(self, n):
             # Get the ith count-and-say sequence by scan pre_str
             length = len(pre_str)
             current_str = ""
-            index = 0
 
             # Count and say the pre_str
+            index = 0
             while index < length:
                 char = pre_str[index]
                 repeat = 0
-                pos = repeat + index + 1
+                pos = index + 1
                 while pos < length and pre_str[pos] == char:
                     repeat += 1
-                    pos = repeat + index + 1
+                    pos += 1
 
-                if repeat:
-                    current_str = current_str + str(repeat + 1) + char
-                else:
-                    current_str = current_str + "1" + char
-                index = index + repeat + 1
+                current_str += str(repeat + 1) + char
+                index = pos
 
             pre_str = current_str
 
         return pre_str
+
+"""
+1
+5
+15
+"""