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  1. #include <iostream>
  2. #include <algorithm>
  3.  
  4. using namespace std;
  5.  
  6. class MangDong
  7. {
  8. private:
  9. 	int* arr;
  10. 	int n;
  11. public:
  12. 	MangDong();
  13. 	void nhap();
  14. 	void xuat();
  15. 	void sapXep();
  16. 	int soLonThuNhi();
  17. 	~MangDong();
  18. };
  19.  
  20. MangDong::MangDong() : arr(nullptr), n(0) {};
  21.  
  22. void MangDong::nhap()
  23. {
  24. 	cout << "Nhap kich thuoc mang: ";
  25. 	cin >> n;
  26.  
  27. 	arr = new int[n];
  28.  
  29. 	for (int i = 0; i < n; ++i)
  30. 	{
  31. 		cout << "Nhap phan tu " << i + 1 << ": ";
  32. 		cin >> arr[i];
  33. 	}
  34. }
  35.  
  36. void MangDong::xuat()
  37. {
  38. 	cout << "Mang: ";
  39. 	for (int i = 0; i < n; ++i)
  40. 		cout << arr[i] << " ";
  41.  
  42. 	cout << endl;
  43. } 
  44.  
  45. void MangDong::sapXep()
  46. {
  47. 	sort(arr, arr + n);
  48. }
  49.  
  50. int MangDong::soLonThuNhi()
  51. {
  52. 	if (n < 2)
  53. 		return cout << "Khong du kich thuoc\n", -1;
  54.  
  55. 	int max1 = arr[n - 1];
  56. 	int max2 = -1;
  57.  
  58. 	for (int i = n - 2; i >= 0; --i)
  59. 	{
  60. 		if (arr[i] < max1)
  61. 		{
  62. 			max2 = arr[i];
  63. 			break;
  64. 		}
  65. 	}
  66.  
  67. 	if (max2 == -1)
  68. 		cout << "Khong co so lon thu hai\n";
  69.  
  70. 	return max2;
  71. }
  72.  
  73. MangDong::~MangDong()
  74. {
  75. 	if (arr)
  76. 	{
  77. 		delete[] arr;
  78. 		arr = nullptr;
  79. 	}
  80. }
  81.  
  82. int main()
  83. {
  84. 	MangDong arr;
  85.  
  86. 	arr.nhap();
  87. 	arr.sapXep();
  88. 	arr.xuat();
  89. 	cout << arr.soLonThuNhi() << endl;
  90.  
  91. 	return 0;
  92. }
Success #stdin #stdout 0.01s 5284KB
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Nhap kich thuoc mang: Mang: 
Khong du kich thuoc
-1
https://ideone.com/RfbKtQ
language:
C++ (gcc 8.3)
created:
5 days ago
visibility:
public

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