#include <stdio.h>
#include <stdint.h>
#include <string.h>
#define MAX 10
void process_stack(int n) {
// Your logic here
int stack[MAX], data;
int top = -1;
char command[20];
// Duyet Stack
for(int i = 0; i < n; i++){
scanf("%s", command);
//PUSH
if(strcmp(command, "push") == 0){
scanf("%d", &data);
if(top == MAX-1) printf("Stack Overflow\n");
else{
top++;
stack[top] = data;
}
}
else if(strcmp(command, "pop") == 0){
if(top == -1) printf("Stack Underflow\n");
else{
printf("%d\n", stack[top]);
top--;
}
}
}
}
int main() {
int n;
scanf("%d", &n);
getchar(); // Consume newline after number
process_stack(n);
return 0;
}
Input
5 push 10 push 20 pop pop pop
Expected Output
20 10 Stack Underflow