001
002
003
004
005
006
007
008
009
010
011
012
013
014
015
016
017
018
019
020
021
022
023
024
025
026
027
028
029
030
031
032
033
034
035
036
037
038
039
040
041
042
043
044
045
046
047
048
049
050
051
052
053
054
055
056
057
058
059
060
061
062
063
064
065
066
067
068
069
070
071
072
073
074
075
076
077
078
079
080
081
082
083
084
085
086
087
088
089
090
091
092
093
094
095
096
097
098
099
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
package algs11;

import java.util.Arrays;
import stdlib.*;

/**
 * This is a skeleton file for your homework. Edit the sections marked TODO. You
 * may also edit the function "main" to test your code.
 *
 * You must not change the declaration of any method. This will be true of every
 * skeleton file I give you.
 *
 * For example, you will get zero points if you change the line
 * 
 * <pre>
 *     public static double minValue (double[] list) {
 * </pre>
 * 
 * to something like
 * 
 * <pre>
 *     public static void minValue (double[] list) {
 * </pre>
 * 
 * or
 * 
 * <pre>
 *     public static double minValue (double[] list, int i) {
 * </pre>
 * 
 * Each of the functions below is meant to be SELF CONTAINED. This means that
 * you should use no other functions or classes. You should not use any HashSets
 * or ArrayLists, or anything else! In addition, each of your functions should
 * go through the argument array at most once. The only exception to this
 * removeDuplicates, which is allowed to call numUnique and then go through the
 * array once after that.
 */
public class MyFirstHomeworkFor300 {

  /**
   * minValue returns the minimum value in an array of doubles. You can assume
   * the array is nonempty and has no duplicates. Your solution must go
   * through the array exactly once. Your solution must not call any other
   * functions. Here are some examples (using "==" informally):
   *
   * <pre>
   *   -7  == minValue (new double[] { -7 })
   *    1  == minValue (new double[] { 1, 7, 8, 11 })
   *   -7  == minValue (new double[] { 1, -4, -7, 7, 8, 11 })
   *   -13 == minValue (new double[] { -13, -4, -7, 7, 8, 11 })
   *   -13 == minValue (new double[] { 1, -4, -7, 7, 8, 11, -13 })
   * </pre>
   */
  public static double minValue (double[] list) {
    return StdRandom.uniform (); //TODO: fix this
  }

  /**
   * minPosition returns the position of the minimum value in an array of
   * doubles. The first position in an array is 0 and the last is the
   * array.length-1.
   *
   * You can assume the array is nonempty and has no duplicates. Your solution
   * must go through the array exactly once. Your solution must not call any
   * other functions. Here are some examples (using "==" informally):
   *
   * <pre>
   *   0 == minPosition(new double[] { -7 })
   *   2 == minPosition(new double[] { 1, -4, -7, 7, 8, 11 })
   *   0 == minPosition(new double[] { -13, -4, -7, 7, 8, 11 })
   *   6 == minPosition(new double[] { 1, -4, -7, 7, 8, 11, -9 })
   * </pre>
   */
  public static int minPosition (double[] list) {
    return StdRandom.uniform (100); //TODO: fix this
  }

  /**
   * distanceBetweenMinAndMax returns difference between the minPosition and
   * the maxPosition in an array of doubles.
   *
   * You can assume the array is nonempty and has no duplicates. Your solution
   * must go through the array exactly once. Your solution must not call any
   * other functions. Here are some examples (using "==" informally):
   *
   * <pre>
   *   0 == distanceBetweenMinAndMax(new double[] { -7 })                      // -7,-7 are the min and max
   *   3 == distanceBetweenMinAndMax(new double[] { 1, -4, -7, 7, 8, 11 }),    // -7,11
   *   5 == distanceBetweenMinAndMax(new double[] { -13, -4, -7, 7, 8, 11 })   // -13,11
   *   1 == distanceBetweenMinAndMax(new double[] { 1, -4, -7, 7, 8, 11, -9 }) // -9,11
   * </pre>
   */
  public static int distanceBetweenMinAndMax (double[] list) {
    return StdRandom.uniform (100); //TODO: fix this
  }

  /**
   * A test program, using private helper functions. See below. To make typing
   * tests a little easier, I've written a function to convert strings to
   * arrays. See below.
   */
  public static void main (String[] args) {
    // for minValue: array must be nonempty with unique elements
    testMinValue (11, "11");
    testMinValue (-11, "-11");
    testMinValue (9, "9 11 21 31 41");
    testMinValue (9, "11 9 21 31 41");
    testMinValue (9, "11 21 9 31 41");
    testMinValue (9, "11 21 31 9 41");
    testMinValue (9, "11 21 31 41 9");
    testMinValue (-99, "-99 -11 -21 -31 -41");
    testMinValue (-99, "-11 -99 -21 -31 -41");
    testMinValue (-99, "-11 -21 -99 -31 -41");
    testMinValue (-99, "-11 -21 -31 -99 -41");
    testMinValue (-99, "-11 -21 -31 -41 -99");
    testMinValue (-7, "1 -4 -7 7 8 11 9 -5");
    testMinValue (-0.5, "0.2 -0.5 -0.1");

    // for minPosition: array must be nonempty with unique elements
    testMinPosition (0, "11");
    testMinPosition (0, "-11");
    testMinPosition (0, "9 11 21 31 41");
    testMinPosition (1, "11 9 21 31 41");
    testMinPosition (2, "11 21 9 31 41");
    testMinPosition (3, "11 21 31 9 41");
    testMinPosition (4, "11 21 31 41 9");
    testMinPosition (0, "-99 -11 -21 -31 -41");
    testMinPosition (1, "-11 -99 -21 -31 -41");
    testMinPosition (2, "-11 -21 -99 -31 -41");
    testMinPosition (3, "-11 -21 -31 -99 -41");
    testMinPosition (4, "-11 -21 -31 -41 -99");
    testMinPosition (2, "1 -4 -7 7 8 11 9 -5");
    testMinPosition (1, "0.2 -0.5 -0.1");

    // for distanceBetweenMinAndMax: array must be nonempty with unique elements
    testDistanceBetweenMinAndMax (0, "11");
    testDistanceBetweenMinAndMax (0, "-11");
    testDistanceBetweenMinAndMax (4, "9 11 21 31 41");
    testDistanceBetweenMinAndMax (3, "11 9 21 31 41");
    testDistanceBetweenMinAndMax (2, "11 21 9 31 41");
    testDistanceBetweenMinAndMax (1, "11 21 31 9 41");
    testDistanceBetweenMinAndMax (1, "11 21 31 41 9");
    testDistanceBetweenMinAndMax (4, "9 -11 -21 -31 -41");
    testDistanceBetweenMinAndMax (3, "-11 9 -21 -31 -41");
    testDistanceBetweenMinAndMax (2, "-11 -21 9 -31 -41");
    testDistanceBetweenMinAndMax (1, "-11 -21 -31 9 -41");
    testDistanceBetweenMinAndMax (1, "-11 -21 -31 -41 9");
    testDistanceBetweenMinAndMax (3, "1 -4 -7 7 8 11 9 -5");
    testDistanceBetweenMinAndMax (3, "0.1 -0.4 -0.7 0.7 0.8 1.1 0.9 -0.5");

    StdOut.println ("Finished tests");
  }

  /* Test functions --- lot's of similar code! */
  private static void testMinValue (double expected, String list) {
    double[] aList = doublesFromString (list);
    double actual = minValue (aList);
    if (!Arrays.equals (aList, doublesFromString (list))) {
      StdOut.format ("Failed minValue([%s]): Array modified\n", list);
    }
    if (expected != actual) {
      StdOut.format ("Failed minValue([%s]): Expecting (%.1f) Actual (%.1f)\n", list, expected, actual);
    }
  }
  private static void testMinPosition (int expected, String list) {
    double[] aList = doublesFromString (list);
    int actual = minPosition (aList);
    if (!Arrays.equals (aList, doublesFromString (list))) {
      StdOut.format ("Failed minPosition([%s]): Array modified\n", list);
    }
    if (expected != actual) {
      StdOut.format ("Failed minPosition([%s]): Expecting (%d) Actual (%d)\n", list, expected, actual);
    }
  }
  private static void testDistanceBetweenMinAndMax (int expected, String list) {
    double[] aList = doublesFromString (list);
    int actual = distanceBetweenMinAndMax (aList);
    if (!Arrays.equals (aList, doublesFromString (list))) {
      StdOut.format ("Failed distanceBetweenMinAndMax([%s]): Array modified\n", list);
    }
    if (expected != actual) {
      StdOut.format ("Failed distanceBetweenMinAndMax([%s]): Expecting (%d) Actual (%d)\n", list, expected, actual);
    }
  }

  /* A utility function to create an array of doubles from a string. */
  // The string should include a list of numbers, separated by single spaces.
  private static double[] doublesFromString (String s) {
    if ("".equals (s)) return new double[0]; // empty array is a special case
    String[] nums = s.split (" ");
    double[] result = new double[nums.length];
    for (int i = nums.length - 1; i >= 0; i--) {
      try {
        result[i] = Double.parseDouble (nums[i]);
      } catch (NumberFormatException e) {
        throw new IllegalArgumentException (String.format ("Bad argument \"%s\": could not parse \"%s\" as a double", s, nums[i]));
      }
    }
    return result;
  }
}