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  1. #include<stdio.h>
  2. #define MIN -65535
  3.  
  4. struct binaryTreeNode{
  5. 	int data;
  6. 	struct binaryTreeNode * left;
  7. 	struct binaryTreeNode * right;
  8. };
  9.  
  10. struct node
  11. {
  12. 	struct binaryTreeNode * data;
  13. 	struct node * next;
  14. };
  15.  
  16. struct queue
  17. {
  18. 	struct node * front;
  19. 	struct node * rear;
  20. };
  21.  
  22. struct queue * enQueue(struct queue * q, struct binaryTreeNode * num)
  23. {
  24. 	struct node * temp = (struct node*)malloc(sizeof(struct node));
  25. 	temp -> data = num;
  26. 	temp -> next = NULL;
  27. 	if(q == NULL)
  28. 	{
  29. 		q = (struct queue*)malloc(sizeof(struct queue));		
  30. 		q -> front = temp;
  31. 	}
  32. 	else
  33. 		q -> rear -> next = temp;
  34. 	q -> rear = temp;
  35. 	//Code obtained from http://w...content-available-to-author-only...w.studyalgorithms,com
  36. 	//Feel free to copy but please acknowledge the site wherever possible
  37. 	return q;
  38. }
  39.  
  40. struct queue * deQueue(struct queue * q)
  41. {
  42. 	struct node * temp = q->front;
  43. 	q -> front = q->front->next;
  44. 	free(temp);
  45. 	if(q->front == NULL)
  46. 		return NULL;
  47. 	else
  48. 		return q;
  49. }
  50.  
  51. int isQueueEmpty(struct queue * q)
  52. {
  53. 	if(q)
  54. 		return 0;
  55. 	else
  56. 		return 1;
  57. }
  58.  
  59. int findMaxInTree(struct binaryTreeNode * root)
  60. {
  61. 	// A variable for root value
  62. 	int root_val;
  63.  
  64. 	// Variable to store values in left and right tree
  65. 	int left, right;
  66.  
  67. 	// Initialize it with a minimum value
  68. 	int max = MIN;
  69.  
  70. 	if(root != NULL)
  71. 	{
  72. 		// Get the root value
  73. 		root_val = root -> data;
  74.  
  75. 		// Find the maximum value in left sub-tree
  76. 		left = findMaxInTree(root -> left);
  77.  
  78. 		// Find the maximum value in right sub-tree
  79. 		right = findMaxInTree(root -> right);
  80.  
  81. 		// Now find the largest of 3 values
  82. 		// Find which is big among left and right
  83. 		if(left > right)
  84. 			max = left;
  85. 		else
  86. 			max = right;
  87.  
  88. 		// Compare the max with root value
  89. 		if(root_val > max)
  90. 			max = root_val;
  91. 	}
  92.  
  93. 	return max;
  94. }
  95.  
  96. int findMaxInTreeNonRecursive(struct binaryTreeNode * root)
  97. {
  98. 	// Initialize max with a very less value;
  99. 	int max = MIN;
  100.  
  101. 	// Level Order Traversal
  102. 	struct binaryTreeNode * temp = NULL;
  103. 	struct queue * Q = NULL;
  104. 	if(root == NULL)
  105. 		return;
  106.  
  107. 	Q = enQueue(Q, root);
  108.  
  109. 	while(!isQueueEmpty(Q))
  110. 	{
  111. 		temp = Q -> front -> data;
  112.  
  113. 		Q = deQueue(Q);
  114.  
  115. 		// Find the max value
  116. 		if(temp -> data > max)
  117. 			max = temp -> data;
  118.  
  119. 		if(temp -> left)
  120. 			Q = enQueue(Q, temp -> left);
  121. 		if(temp -> right)
  122. 			Q = enQueue(Q, temp -> right);
  123. 	}
  124. 	free(Q);
  125.  
  126. 	return max;
  127. }
  128.  
  129. // Test the above functions
  130. int main(void)
  131. {
  132. 	// Initialize the tree
  133. 	struct binaryTreeNode * root = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  134. 	root-> data = 1;
  135. 	struct binaryTreeNode * l = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  136. 	l -> data = 2;
  137. 	struct binaryTreeNode * ll = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  138. 	ll -> data = 4;
  139. 	ll -> left = ll -> right = NULL;
  140. 	struct binaryTreeNode * lr = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  141. 	lr -> data = 5;
  142. 	lr -> left = lr -> right = NULL;
  143. 	l -> left = ll;
  144. 	l -> right = lr;
  145. 	struct binaryTreeNode * r = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  146. 	r -> data = 3;
  147. 	struct binaryTreeNode * rl = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  148. 	rl -> data = 6;
  149. 	rl -> left = rl -> right = NULL;
  150. 	struct binaryTreeNode * rr = (struct binaryTreeNode *)malloc(sizeof(struct binaryTreeNode));
  151. 	rr -> data = 7;
  152. 	rr -> left = rr -> right = NULL;
  153. 	r -> left = rl;
  154. 	r -> right = rr;
  155. 	root -> left = l;
  156. 	root -> right = r;
  157.  
  158. 	// Non-recursive version
  159. 	printf("max = %d",findMaxInTree(root));
  160.  
  161. 	// Recursive version
  162. 	printf("max = %d",findMaxInTreeNonRecursive(root));
  163.  
  164. 	return 0;
  165. }
Success #stdin #stdout 0s 2424KB
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max = 7max = 7
https://ideone.com/7GvTS5
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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