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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. #define MAX_SIZE 100
  5.  
  6.  
  7.     int stack[MAX_SIZE];
  8.     int top=-1,count=0;
  9.  
  10. void push(int x, int y)
  11.  {
  12.     if (count+2 <= MAX_SIZE )
  13.  {
  14.         stack[++top] = x;
  15. count++;
  16.         stack[++top] = y;
  17. count++;
  18.         printf("Pushed\n");
  19.     } else {
  20.         printf("Overflow\n");
  21.     }
  22. }
  23.  
  24. void pop() {
  25.     if (count< 2) {
  26.         printf("Underflow\n");
  27.     } else {
  28.         int x = stack[top--];
  29. count--;
  30.         int y = stack[top--];
  31. count--;
  32.         if (count < MAX_SIZE ) {
  33.             stack[++top] = y;
  34. count++;
  35.         }
  36.     }
  37. }
  38.  
  39. void top_element()
  40. {
  41.     if (top== -1) {
  42.         printf("Empty\n");
  43.     } else {
  44.         printf("%d\n", stack[top]);
  45.     }
  46. }
  47.  
  48. int main() {
  49.    stack;
  50.     top = -1;
  51.  
  52.     int n;
  53.     scanf("%d", &n);
  54.  
  55.     for (int i = 0; i < n; i++) {
  56.         int command;
  57.         scanf("%d", &command);
  58.  
  59.         if (command == 1) {
  60.             int x, y;
  61.             scanf("%d %d", &x, &y);
  62.             push( x, y);
  63.         } else if (command == 2) {
  64.             pop();
  65.         } else if (command == 3) {
  66.             top_element();
  67.         }
  68.     }
  69.  
  70.     return 0;
  71. }
Success #stdin #stdout 0.01s 5272KB
comments (?)
stdin
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3
3
2
1 2 3
stdout
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Empty
Underflow
Pushed
https://ideone.com/Oyi2qY
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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