Update compress challenge

Add C Algorithm to resolve the compress string challenge

arrays_strings/compress/compress.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *compress (char *s);
+char *_calc_partial_result (char p_char, char count);
+int main ( ){
+  printf("%s\n",compress("AABBCC"));
+  return 0;
+}
+
+
+char *compress ( char *s){
+  char *result = (char*) malloc(strlen(s)); // result string
+  char prev_char; // previous char
+  int count = 0; // count defines
+  char *p_count;
+  int i;
+  if(sizeof(s) == 0)
+    return NULL;
+  prev_char = s[0];
+  for (i=0; i<strlen(s); i+=1){
+    if (s[i] == prev_char)
+      count+=1;
+    else{
+      asprintf(&p_count, "%i", count);
+      strcat(result, _calc_partial_result(prev_char, *p_count));
+      prev_char = s[i];
+      count = 1;
+    }
+  }
+  asprintf(&p_count, "%i", count);
+  strcat(result, _calc_partial_result(prev_char, *p_count));
+  if(strlen(result)<strlen(s))
+    return result;
+  else
+    return s;
+}
+
+char *_calc_partial_result (char p_char, char count){
+  char *buff;
+  int c = atoi(&count);
+  if(c > 1){
+    buff = (char*) malloc(sizeof(p_char) + sizeof(count));
+    strcpy(buff, &p_char);
+    strcat(buff, &count);
+  }else{
+    buff = (char*) malloc(sizeof(p_char));
+    strncpy(buff, &p_char, sizeof(p_char));
+  }
+  return buff;
+}

arrays_strings/compress/compress_solution.ipynb

@@ -2,21 +2,30 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "This notebook was prepared by [Donne Martin](http://donnemartin.com). Source and license info is on [GitHub](https://github.com/donnemartin/interactive-coding-challenges)."
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "# Solution Notebook"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Problem: Compress a string such that 'AAABCCDDDD' becomes 'A3BC2D4'.  Only compress the string if it saves space.\n",
     "\n",
@@ -29,7 +38,10 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Constraints\n",
     "\n",
@@ -46,7 +58,10 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Test Cases\n",
     "\n",
@@ -58,7 +73,10 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Algorithm\n",
     "\n",
@@ -84,7 +102,10 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Code"
    ]
@@ -93,7 +114,9 @@
    "cell_type": "code",
    "execution_count": 1,
    "metadata": {
-    "collapsed": false
+    "collapsed": false,
+    "deletable": true,
+    "editable": true
    },
    "outputs": [],
    "source": [
@@ -121,7 +144,10 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "deletable": true,
+    "editable": true
+   },
    "source": [
     "## Unit Test"
    ]
@@ -130,7 +156,9 @@
    "cell_type": "code",
    "execution_count": 2,
    "metadata": {
-    "collapsed": false
+    "collapsed": false,
+    "deletable": true,
+    "editable": true
    },
    "outputs": [
     {
@@ -172,7 +200,9 @@
    "cell_type": "code",
    "execution_count": 3,
    "metadata": {
-    "collapsed": false
+    "collapsed": false,
+    "deletable": true,
+    "editable": true
    },
    "outputs": [
     {
@@ -190,9 +220,9 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 2",
    "language": "python",
-   "name": "python3"
+   "name": "python2"
   },
   "language_info": {
    "codemirror_mode": {