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Why am i getting runtime error for this code?? plz help

#include <iostream>
#include <stack>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
using namespace std;
int main()
{
char a[150];
int i,j,p,n;
scanf("%d",&n);
getchar();
while(n--)
{
stack<char> st ...