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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. void push(int in);
  6. void pop();
  7. void size();
  8. void top();
  9. void empty();
  10.  
  11. int stack[10000] = { 0, };
  12. int len = 0;
  13.  
  14. int main()
  15. {
  16. 	int a;
  17.  
  18. 	scanf("%d", &a);
  19.  
  20. 	for(int i = 0; i < a; i++)
  21. 	{
  22. 		char oper[13];
  23.  
  24. 		int in;
  25.  
  26. 		gets(oper);
  27. 		strtok(oper, " ");
  28.  
  29. 		if(!strcmp(oper, "push"))
  30.         {
  31. 			in = atoi(strtok(NULL, " "));
  32. 			push(in);
  33. 		}
  34. 		else if(!strcmp(oper, "pop"))
  35. 		{
  36. 			pop();
  37. 		}
  38. 		else if(!strcmp(oper, "size"))
  39. 		{
  40. 			size();
  41. 		}
  42. 		else if(!strcmp(oper, "empty"))
  43. 		{
  44. 			empty();
  45. 		}
  46. 		else if(!strcmp(oper, "top"))
  47. 		{
  48. 			top();
  49. 		}
  50.  
  51. 	}
  52.  
  53. 	return 0;
  54. }
  55.  
  56. void push(int in)
  57. {
  58. 	stack[len] = in;
  59. 	len++;
  60.  
  61. }
  62.  
  63. void pop()
  64. {
  65. 	if(stack[0] == 0)
  66. 	{
  67. 		printf("-1\n");
  68. 	}
  69. 	else
  70. 	{
  71. 		printf("%d\n", stack[len-1]);
  72. 		stack[len-1] = 0;
  73. 		if(len>0)
  74. 		{
  75. 			len--;
  76. 		}
  77. 	}
  78.  
  79.  
  80. }
  81.  
  82. void size()
  83. {
  84. 	if(stack[0] == 0)
  85. 	{
  86. 		printf("0\n");
  87. 	}
  88. 	else
  89. 	{
  90. 		printf("%d\n", len);
  91. 	}
  92. }
  93.  
  94. void empty()
  95. {
  96. 	if(stack[0] == 0)
  97. 	{
  98. 		printf("1\n");
  99. 	}
  100. 	else
  101. 	{
  102. 		printf("0\n");
  103. 	}
  104.  
  105. }
  106.  
  107. void top()
  108. {
  109. 	if(stack[0] == 0)
  110. 	{
  111. 		printf("-1\n");
  112. 	}
  113. 	else
  114. 	{
  115. 		printf("%d\n", stack[len-1]);
  116. 	}
  117.  
  118. }
Success #stdin #stdout 0s 4160KB
comments (?)
stdin
copy 
14
push 1
push 2
top
size
empty
pop
pop
pop
size
empty
pop
push 3
empty
top
stdout
copy 
2
2
0
2
1
-1
0
1
-1
0
https://ideone.com/5yUt7G
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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