Initial commit of code for dopelib, and ch 1, 2, and 12

libs/chapter1/chapter1.hpp

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdlib.h>
+
+bool IsUnique(const char* s, int len);
+bool CheckPermutation(const char* s1, const char* s2, size_t s1_len, size_t s2_len);

libs/chapter1/check_permutation.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <string>
+#include "chapter1.hpp"
+
+/* Prompt
+   Check Permutation: Given two strings, write a method to decide if
+   one is a permutation of the other.
+ */
+
+bool CheckPermutation(const char* s1, const char* s2,
+                      size_t s1_len, size_t s2_len){
+
+  int letters1[255] = {};
+  int letters2[255] = {};
+  long unsigned int indx = 0;
+
+  if(s1_len != s2_len){
+    return false;
+  }
+
+  for(indx = 0; indx < s1_len; ++indx){
+    int li1 = static_cast<int>(s1[indx]);
+    int li2 = static_cast<int>(s2[indx]);
+    letters1[li1] += 1;
+    letters2[li2] += 1;
+  }
+
+  for(indx = 0; indx < 255; ++indx){
+    if (letters1[indx] != letters2[indx]){
+      return false;
+    }
+  }
+
+  return true;
+}

libs/chapter1/is_unique.cpp

@@ -0,0 +1,21 @@
+#include <iostream>
+#include "chapter1.hpp"
+
+/* Prompt
+   Is Unique: Implement an algorithm to determine if a string
+   has all unique characters. What if you cannot use additional data
+   structures?
+*/
+
+bool IsUnique(const char* s, int len){
+  int tracker[255]= {};
+
+  for(int i=0; i<len; ++i){
+    int tracker_index = static_cast<int>(s[i]);
+    tracker[tracker_index] += 1;
+    if (tracker[tracker_index] > 1){
+      return false;
+    }
+  }
+  return true;
+}

libs/chapter1/meson.build

@@ -0,0 +1,5 @@
+
+chapter1_sources = ['is_unique.cpp', 'check_permutation.cpp']
+
+chapter1_lib = static_library('chapter1',
+                              chapter1_sources)