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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 (top < 1) {
  26.         printf("Underflow\n");
  27.     } else {
  28.         int x = stack[top--];
  29.         int y = stack[top--];
  30.         if (top < MAX_SIZE - 1) {
  31.             stack[++top] = y;
  32.         }
  33.     }
  34. }
  35.  
  36. void top_element()
  37. {
  38.     if (top== -1) {
  39.         printf("Empty\n");
  40.     } else {
  41.         printf("%d\n", stack[top]);
  42.     }
  43. }
  44.  
  45. int main() {
  46.    stack;
  47.     top = -1;
  48.  
  49.     int n;
  50.     scanf("%d", &n);
  51.  
  52.     for (int i = 0; i < n; i++) {
  53.         int command;
  54.         scanf("%d", &command);
  55.  
  56.         if (command == 1) {
  57.             int x, y;
  58.             scanf("%d %d", &x, &y);
  59.             push( x, y);
  60.         } else if (command == 2) {
  61.             pop();
  62.         } else if (command == 3) {
  63.             top_element();
  64.         }
  65.     }
  66.  
  67.     return 0;
  68. }
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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3
3
2
1 2 3
stdout
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Empty
Underflow
Pushed
https://ideone.com/njz4yL
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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