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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. int size()
  10. {
  11. return count;
  12. }
  13.  
  14. void push(int x, int y)
  15.  {
  16.     if (count+2<=MAX_SIZE )
  17.  {
  18.         stack[++top] = x;
  19. count++;
  20.         stack[++top] = y;
  21. count++;
  22.         printf("Pushed\n");
  23.     } else {
  24.         printf("Overflow\n");
  25.     }
  26. }
  27.  
  28. void pop() {
  29.     if (count< 2) {
  30.         printf("Underflow\n");
  31.     } else {
  32.         int x = stack[top--];
  33. count--;
  34.         int y = stack[top--];
  35. count--;
  36. int sum=x+y;
  37.  
  38.         if (count< MAX_SIZE ) {
  39.             stack[++top] = sum;
  40.         }
  41.     }
  42. }
  43.  
  44. int top_element()
  45. {
  46.     return (count>0)?stack[top]:-1;
  47. }
  48.  
  49. int main() {
  50.    stack;
  51.     top = -1;
  52.  
  53.     int n;
  54.     scanf("%d", &n);
  55.  
  56.     for (int i = 0; i < n; i++) {
  57.         int command;
  58.         scanf("%d", &command);
  59.  
  60.         if (command == 1) {
  61.             int x, y;
  62.             scanf("%d %d", &x, &y);
  63.             push( x, y);
  64.         } else if (command == 2) {
  65.             pop();
  66.         } else if (command == 3) {
  67.             top_element();
  68.         }
  69.     }
  70.  
  71.     return 0;
  72. }
Success #stdin #stdout 0s 5252KB
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Pushed
https://ideone.com/kHKmF3
language:
C++ (gcc 8.3)
created:
26 days ago
visibility:
public

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