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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;
  9.  
  10. void push(int x, int y)
  11.  {
  12.     if (top < MAX_SIZE - 2)
  13.  {
  14.         stack[++top] = x;
  15.         stack[++top] = y;
  16.         printf("Pushed\n");
  17.     } else {
  18.         printf("Overflow\n");
  19.     }
  20. }
  21.  
  22. void pop() {
  23.     if (top < 1) {
  24.         printf("Underflow\n");
  25.     } else {
  26.         int x = stack[top--];
  27.         int y = stack[top--];
  28.         if (top < MAX_SIZE - 1) {
  29.             stack[++top] = y;
  30.         }
  31.     }
  32. }
  33.  
  34. void top_element()
  35. {
  36.     if (top== -1) {
  37.         printf("Empty\n");
  38.     } else {
  39.         printf("%d\n", stack[top]);
  40.     }
  41. }
  42.  
  43. int main() {
  44.    stack;
  45.     top = -1;
  46.  
  47.     int n;
  48.     scanf("%d", &n);
  49.  
  50.     for (int i = 0; i < n; i++) {
  51.         int command;
  52.         scanf("%d", &command);
  53.  
  54.         if (command == 1) {
  55.             int x, y;
  56.             scanf("%d %d", &x, &y);
  57.             push( x, y);
  58.         } else if (command == 2) {
  59.             pop();
  60.         } else if (command == 3) {
  61.             top_element();
  62.         }
  63.     }
  64.  
  65.     return 0;
  66. }
Success #stdin #stdout 0.01s 5280KB
comments (?)
stdin
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3
3
2
1 2 3
stdout
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Empty
Underflow
Pushed
https://ideone.com/Jxh9NQ
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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