<OFFER03>03_01_DuplicationInArray

  1 #include<cstdio>
  2 
  3 bool duplicate(int numbers[], int length, int* duplication)
  4 {
  5     if (numbers == nullptr || length <= 0)
  6         return false;
  7     for (int i = 0; i < length; ++i)
  8     {
  9         if (numbers[i] < 0 || numbers[i] > length - 1)
 10             return false;
 11 
 12     }
 13     for (int i = 0; i < length; ++i)
 14     {
 15         while (numbers[i] != i)
 16         {
 17             if (numbers[i] == numbers[numbers[i]])
 18             {
 19                 *duplication = numbers[i]; // 
 20                 return true;
 21             }
 22 
 23             int temp = numbers[i];
 24             numbers[i] = numbers[temp];
 25             numbers[temp] = temp;
 26 
 27 
 28         }
 29         return false;
 30     }
 31 }
 32 // test codes
 33 bool contains(int array[], int length, int number)
 34 {
 35     for (int i = 0; i < length; ++i)
 36     {
 37         if (array[i] == number)
 38             return true;
 39     }
 40     return false;
 41 }
 42 void test(char* testName, int numbers[], int lengthNumbers, int expected[],  43     int expectedExpected, bool validArgument)
 44 {
 45     printf("%s begins: ", testName);
 46     int duplication;
 47     bool validInput = duplicate(numbers, lengthNumbers, &duplication);
 48 
 49     if (validArgument == validInput)
 50     {
 51         if (validArgument)
 52         {
 53             if (contains(expected, expectedExpected, duplication))
 54                 printf("Passed.\n");
 55             else
 56                 printf("Failed.\n");
 57         }
 58         else
 59             printf("Passed.\n");
 60     }
 61     else
 62         printf("Failed.\n");
 63 }
 64 
 65 void test1()
 66 {
 67     int numbers[] = { 2,1,3,1,4 };
 68     int duplications[] = { 1 };
 69     test("Test1", numbers, sizeof(numbers) / sizeof(int), duplications, sizeof(duplications) / sizeof(int), true);
 70 }
 71 void test3()
 72 {
 73     int numbers[] = { 2,4,2,1,4 };
 74     int duplications[] = { 2,4 };
 75     test("Test1", numbers, sizeof(numbers) / sizeof(int), duplications, sizeof(duplications) / sizeof(int), true);
 76 }
 77 
 78 // 无效的输入
 79 void test6()
 80 {
 81     int* numbers = nullptr;
 82     int duplications[] = { -1 }; // not in use in the test function
 83     test("Test6", numbers, 0, duplications, sizeof(duplications) / sizeof(int), false);
 84 }
 85 
 86 // 没有重复的数字
 87 void test4()
 88 {
 89     int numbers[] = { 2, 1, 3, 0, 4 };
 90     int duplications[] = { -1 }; // not in use in the test function
 91     test("Test4", numbers, sizeof(numbers) / sizeof(int), duplications, sizeof(duplications) / sizeof(int), false);
 92 }
 93 
 94 // 没有重复的数字
 95 void test5()
 96 {
 97     int numbers[] = { 2, 1, 3, 5, 4 };
 98     int duplications[] = { -1 }; // not in use in the test function
 99     test("Test5", numbers, sizeof(numbers) / sizeof(int), duplications, sizeof(duplications) / sizeof(int), false);
100 }
101 // 重复的数字是数组中最大的数字
102 void test2()
103 {
104     int numbers[] = { 2, 4, 3, 1, 4 };
105     int duplications[] = { 4 };
106     test("Test2", numbers, sizeof(numbers) / sizeof(int), duplications, sizeof(duplications) / sizeof(int), true);
107 }
108 void main()
109 {
110     test1();
111     test2();
112     test3();
113     test4();
114     test5();
115     test6();
116 }