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dhaase - problem solving training #32

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5244935
Finished training
DarylHaase Jul 14, 2016
902fe90
removed commented out line
DarylHaase Jul 14, 2016
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161 changes: 140 additions & 21 deletions problem-solving/Program.cs
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Original file line number Diff line number Diff line change
@@ -1,9 +1,12 @@
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Xml.Schema;

namespace problem_solving
{
Expand All @@ -16,85 +19,126 @@ static void Main(string[] args)
public static long SumArray(IEnumerable<int> arr)
{
// return the sum of all the values in the array
// TODO
return 0;
return arr.Sum(a => Convert.ToInt64(a, CultureInfo.InvariantCulture));
}

public static long SumArrayOddValues(IEnumerable<int> arr)
{
// return the sum of all the values in the array that are odd
// TODO
return 0;
return arr.Where(a => (a%2 != 0)).Sum();
}

public static long SumArrayEverySecondValue(IEnumerable<int> arr)
{
// return the sum of every second value in the array. i.e. the 2nd value + the 4th value + the 6th value ...
// TODO
return 0;
return arr.Where((a, index) => (index + 1) %2 == 0).Sum();
}

public static IEnumerable<int> GetUniqueValues(IEnumerable<int> arr)
{
// return an array that contains only unique values from the passed in array
// TODO
return null;
return arr.Distinct();
}

public static IEnumerable<int> GetArrayIntersect(IEnumerable<int> arrA, IEnumerable<int> arrB)
{
// return an array that contains all the values that are in array A and array B
// TODO
return null;
return arrA.Where(a => arrB.Contains(a)).Distinct();
}

public static IEnumerable<int> GetArrayNotIntersect(IEnumerable<int> arrA, IEnumerable<int> arrB)
{
// return an array that contains all the values that are in array A or array B but not in both array A and array B
// TODO
return null;
return arrA.Where(a => !arrB.Contains(a)).Concat(
arrB.Where(b => !arrA.Contains(b))).Distinct();
}

public static Boolean HasSum(IEnumerable<int> arr, long target)
{
// return true if any 2 values in the array have a sum equal to the target value
// TODO
if (arr == null || target == null)
throw new NullReferenceException();

for(int i=0; i < arr.Count(); i++)
{
var tempArr = arr.ToList();

int currVal = tempArr[i];
tempArr.RemoveAt(i);

int diff = (int)target - currVal;

if (tempArr.Contains(diff))
return true;
}

return false;
}

public static long LoneSum(IEnumerable<int> arr)
{
// Given an array of int values, return their sum.
// However, if any of the values is the same as another of the values, it does not count towards the sum.
return 0;
return arr.Aggregate(0,(total, next) => arr.Count(a => a == next) > 1 ? total : total + next);
}

public static String DoubleString(String s)
{
// return a string that is the original string with each character in the string repeated twice
// e.g. for input "ABCDE", return "AABBCCDDEE"
return null;
if (s == null)
throw new ArgumentNullException();

int i = 1;
foreach (char c in s)
{
s = s.Insert(i + (i-1), c.ToString());
i++;
}

return s;
}

public static int CountChars(String s, char c)
{
// return the count of how many times char c occurs in string s
return 0;
return s.Count(character => character == c);
}

public static long SumDigits(String s)
{
// return the sum of the digits 0-9 that appear in the string, ignoring all other characters
// e.g. "123" return 6
return 0;
if (s == null)
throw new ArgumentNullException();

long total = 0;

foreach (char c in s)
{
try
{
total += Convert.ToInt32(c.ToString(), CultureInfo.InvariantCulture);
}
catch (System.FormatException){}
}

return total;
}

public static long SumNumbers(String s)
{
// return the sum of the numbers that appear in the string, ignoring all other characters
// a number is a series of 1 or more digits in a row
// e.g. "11 22" returns 33
return 0;
if (s == null)
throw new ArgumentNullException();

// *** THIS REGEX SPLIT HAS A PROBLEM WITH ESCAPE CHARACTERS ***
String[] strings = Regex.Split(s, @"\D+");
strings = strings.Where(str => !String.IsNullOrEmpty(str)).ToArray();

return strings.Sum(str => Convert.ToInt32(str, CultureInfo.InvariantCulture));
}

public static Boolean IsAnagram(String s1, String s2)
Expand All @@ -103,6 +147,23 @@ public static Boolean IsAnagram(String s1, String s2)
// An anagram is produced by rearranging the letters of one string into another
// e.g. care is an anagram of race
// cat is not an anagram of rat
if (s1 == null || s2 == null)
throw new NullReferenceException();

List<char> s1List = s1.ToList();
List<char> s2List = s2.ToList();

foreach (char c in s1List)
{
int loc = s2List.FindIndex(c2 => c2 == c);

if (loc == -1) return false;

s2List.RemoveAt(loc);
}

if (s2List.Count == 0) return true;

return false;
}

Expand All @@ -111,6 +172,18 @@ public static int BlackJack(int count1, int count2)
// Given 2 integer values greater than 0,
// return whichever value is nearest to 21 without going over.
// Return 0 if they both go over.
if (count1 <= 21)
{
if (count2 > 21)
return count1;

return (Math.Max(count1, count2));
}
else if (count2 <= 21)
{
return count2;
}

return 0;
}

Expand All @@ -119,6 +192,11 @@ public static int FivePlayerBlackJack(int count1, int count2, int count3, int co
// Given 5 integer values greater than 0,
// return whichever value is nearest to 21 without going over.
// Return 0 if they all go over.
List<int> counts = new List<int>(){count1,count2,count3,count4,count5};
IEnumerable<int> didntBust = counts.Where(c => c <= 21);
if (didntBust.Any())
return didntBust.Max();

return 0;
}

Expand All @@ -127,20 +205,48 @@ public static int NPlayerBlackJack(IEnumerable<int> counts)
// Given a list of integer values greater than 0,
// return whichever value is nearest to 21 without going over.
// Return 0 if they all go over.

IEnumerable<int> didntBust = counts.Where(c => c <= 21);
if (didntBust.Any())
return didntBust.Max();

return 0;
}

public static Dictionary<String, int> WordCount(IEnumerable<String> arr)
{
// Given an array of Strings,
// return a dictionary keyed on the string with the count of how many times each string appears in the array
return null;

if (arr == null)
throw new NullReferenceException();

bool contin = true;
Dictionary<String, int> dictionary = new Dictionary<String, int>();
List<String> array = arr.ToList();

while (array.Count > 0)
{
String next = array.First();
int nMatch = array.Count(a => a == next);
array.RemoveAll(a => a == next);
dictionary.Add(next, nMatch);
}

return dictionary;
}

public static int Factorial(int n)
{
// Given n, return the factorial of n, which is n * (n-1) * (n-2) ... 1
return 0;
if (n == 0) return 1;

for (int i = n; i > 1; i--)
{
n *= (i - 1);
}

return n;
}

public static List<String> FB(int n)
Expand All @@ -149,7 +255,20 @@ public static List<String> FB(int n)
// If the number is divisable by 3, replace it with the word "Fizz"
// If the number is divisable by 5, replace it with the word "Buzz"
// If the number is divisable by both 3 and 5, replace it with the word "FizzBuzz"
return null;
List<String> strings = new List<string>();

for (int i = 1; i <= n; i++)
{
if (i%3 == 0 && i%5 == 0)
strings.Add("FizzBuzz");
else if (i%3 == 0)
strings.Add("Fizz");
else if (i%5 == 0)
strings.Add("Buzz");
else strings.Add(i.ToString());
}

return strings;
}
}
}