Day 29, 30 & 31 (#221)

* Add @imkaka as a contributor * day4 * Month End
CodeToExpress · Feb 7, 2019 · e87a474 · e87a474
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diff --git a/day29/C++/binary_search b/day29/C++/binary_search
diff --git a/day29/C++/binary_search.cpp b/day29/C++/binary_search.cpp
@@ -0,0 +1,55 @@
+/*
+* @author : imkaka
+* @date   : 31/1/2019
+*/
+
+#include<iostream>
+#include<cstdio>
+
+using namespace std;
+
+int binary_search_itr(int arr[], int size, int val){
+    int l = 0, r = size-1;
+    int mid = (l + r) / 2;
+
+    while(arr[mid] != val && l <= r){
+        if(val < arr[mid]){
+            r = mid - 1;
+        }
+        else{
+            l = mid +1;
+        }
+
+        mid = (l + r) / 2;
+    }
+
+    if(arr[mid] == val)
+        return mid;
+
+    return -1;
+}
+
+int binary_search_rec(int arr[], int left, int right, int val){
+    if(right >= left){
+
+        int mid = left + (right - left) / 2;
+
+        if(arr[mid] == val) return mid;
+
+        if(arr[mid] > val)
+            return binary_search_rec(arr, left, mid-1, val);
+        return binary_search_rec(arr, mid+1, right, val);
+    }
+
+    return -1;
+}
+
+int main(){
+
+    int arr[] = {1, 2, 3, 6, 9, 15, 16, 14};
+    int val = 9;
+    int size = sizeof(arr)/sizeof(arr[0]);
+    cout << "Iterative: " << binary_search_itr(arr, size, val) << endl;
+    cout << "Recursive: " << binary_search_rec(arr, 0, size-1, val) << endl;
+    return 0;
+}
diff --git a/day29/README.md b/day29/README.md
@@ -41,5 +41,69 @@ function binary (arr, n) {
     return -1;
 }
 
-console.log (binary ([1, 2, 3, 4, 5, 6, 7, 8, 9], 5)); // 4
-```
+console.log (binarySearch ([1, 2, 3, 4, 5, 8, 9], 8));
+console.log (binarySearch ([1, 2, 3, 4, 5, 8, 9], 7));
+```
+
+## C++ Implementation
+
+### [Solution by @imkaka](./C++/binary_search.cpp)
+
+```cpp
+
+/*
+* @author : imkaka
+* @date   : 31/1/2019
+*/
+
+#include<iostream>
+#include<cstdio>
+
+using namespace std;
+
+int binary_search_itr(int arr[], int size, int val){
+    int l = 0, r = size-1;
+    int mid = (l + r) / 2;
+
+    while(arr[mid] != val && l <= r){
+        if(val < arr[mid]){
+            r = mid - 1;
+        }
+        else{
+            l = mid +1;
+        }
+
+        mid = (l + r) / 2;
+    }
+
+    if(arr[mid] == val)
+        return mid;
+
+    return -1;
+}
+
+int binary_search_rec(int arr[], int left, int right, int val){
+    if(right >= left){
+
+        int mid = left + (right - left) / 2;
+
+        if(arr[mid] == val) return mid;
+
+        if(arr[mid] > val)
+            return binary_search_rec(arr, left, mid-1, val);
+        return binary_search_rec(arr, mid+1, right, val);
+    }
+
+    return -1;
+}
+
+int main(){
+
+    int arr[] = {1, 2, 3, 6, 9, 15, 16, 14};
+    int val = 9;
+    int size = sizeof(arr)/sizeof(arr[0]);
+    cout << "Iterative: " << binary_search_itr(arr, size, val) << endl;
+    cout << "Recursive: " << binary_search_rec(arr, 0, size-1, val) << endl;
+    return 0;
+}
+```
diff --git a/day30/C++/naiveSearch b/day30/C++/naiveSearch
diff --git a/day30/C++/naiveSearch.cpp b/day30/C++/naiveSearch.cpp
@@ -0,0 +1,78 @@
+/*
+* @author : imkaka
+* @date   : 1/2/2019
+*/
+
+#include<iostream>
+#include<string>
+
+using namespace std;
+
+void computeLPS(string, int, int []);
+
+// KMP Algorithm
+void KMPsearch(string text, string pat){
+    // Length
+    int N = text.size();
+    int M = pat.size();
+
+    // Define LPS (Longest Proper Prefix)
+    int lps[M];
+
+    //Preprocess
+    computeLPS(pat, M, lps);
+
+    int i = 0, j = 0;
+    while(i < N){
+        //While Match
+        if(pat[j] == text[i]){
+            i++;
+            j++;
+        }
+
+        if(j == M){
+            cout << "Pattern Found At " << (i-j) << endl;
+            j = lps[j-1];
+        }
+
+        else if(i < N && pat[j] != text[i]){
+            if(lps[j] != 0)
+                j = lps[j-1];
+            else
+                i++;
+        }
+    }
+}
+
+void computeLPS(string pat, int M, int lps[]){
+    int len = 0; //Track len of longest common prefix which is suffix also.
+
+    lps[0] = 0;
+    int i = 1;
+
+    while(i < M){
+        if(pat[i] == pat[len]){
+            len++;
+            lps[i] = len;
+            i++;
+        }
+        else{
+            if(len != 0){
+                len = lps[len-1]; //Don't increment i
+            }
+            else{
+                lps[i] = 0;
+                i++;
+            }
+        }
+    }
+}
+
+int main(){
+
+    string txt = "ABABDABACDABABCABAB";
+    string pat = "ABABCABAB";
+
+    KMPsearch(txt, pat);
+    return 0;
+}
diff --git a/day30/README.md b/day30/README.md
@@ -11,7 +11,7 @@ Given a sentence (string), and a pattern, write a function that returns the inde
 **Example**
 
 ```
-input: 
+input:
   str = "Hello World, Coding is beautiful"
   pattern = "World"
 
@@ -26,4 +26,87 @@ output: 6 (start index of the found pattern)
 
 ```js
 to be added
-```
+```
+
+### [C++ Implementation](./C++/naiveSearch.cpp)
+
+```cpp
+/*
+* @author : imkaka
+* @date   : 1/2/2019
+*/
+
+#include<iostream>
+#include<string>
+
+using namespace std;
+
+void computeLPS(string, int, int []);
+
+// KMP Algorithm
+void KMPsearch(string text, string pat){
+    // Length
+    int N = text.size();
+    int M = pat.size();
+
+    // Define LPS (Longest Proper Prefix)
+    int lps[M];
+
+    //Preprocess
+    computeLPS(pat, M, lps);
+
+    int i = 0, j = 0;
+    while(i < N){
+        //While Match
+        if(pat[j] == text[i]){
+            i++;
+            j++;
+        }
+
+        if(j == M){
+            cout << "Pattern Found At " << (i-j) << endl;
+            j = lps[j-1];
+        }
+
+        else if(i < N && pat[j] != text[i]){
+            if(lps[j] != 0)
+                j = lps[j-1];
+            else
+                i++;
+        }
+    }
+}
+
+void computeLPS(string pat, int M, int lps[]){
+    int len = 0; //Track len of longest common prefix which is suffix also.
+
+    lps[0] = 0;
+    int i = 1;
+
+    while(i < M){
+        if(pat[i] == pat[len]){
+            len++;
+            lps[i] = len;
+            i++;
+        }
+        else{
+            if(len != 0){
+                len = lps[len-1]; //Don't increment i
+            }
+            else{
+                lps[i] = 0;
+                i++;
+            }
+        }
+    }
+}
+
+int main(){
+
+    string txt = "ABABDABACDABABCABAB";
+    string pat = "ABABCABAB";
+
+    KMPsearch(txt, pat);
+    return 0;
+}
+```
diff --git a/day31/C++/bubbleSort b/day31/C++/bubbleSort
diff --git a/day31/C++/bubbleSort.cpp b/day31/C++/bubbleSort.cpp
@@ -0,0 +1,53 @@
+/*
+* @author : imkaka
+* @date   : 1/2/2019
+*
+*/
+
+#include<iostream>
+#include<vector>
+
+using namespace std;
+
+void bubblesort(vector<int>& arr){
+    int N = arr.size();
+
+    bool swapped;
+    for(int i = 0; i < N-1; ++i){
+        swapped = false;  // Optimizing part
+        for(int j = 0; j < N-i-1; ++j)    // (j, j+1) Adjacent Swap.
+
+            if(arr[j] > arr[j+1]){  // Swap Part
+                int temp = arr[j];
+                arr[j] = arr[j+1];
+                arr[j+1] = temp;
+                swapped = true;
+            }
+        if(!swapped)
+            break;
+    }
+}
+
+void printArray(const vector<int> &arr){
+    int N = arr.size();
+
+    for(const int x : arr){
+        cout << x << " ";
+    }
+    cout << endl;
+}
+
+int main(){
+
+    vector<int> arr = {20, 10, 0, 36, 100, 12, -20, 30, 50, -100};
+
+    cout << "Unsorted:" << endl;
+    printArray(arr);
+
+    bubblesort(arr);
+
+    cout << "Sorted: " << endl;
+    printArray(arr);
+    return 0;
+}
+