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C++ STL Set 4 (stack).cpp
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C++ STL Set 4 (stack).cpp
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//{ Driver Code Starts
#include <bits/stdc++.h>
using namespace std;
void push(stack<int> &s, int x);
int pop(stack<int> &s);
int getSize(stack<int> &s);
int getTop(stack<int> &s);
int main()
{
// your code goes here
int t;
cin >> t;
while (t--)
{
stack<int> s;
int q;
cin >> q;
while (q--)
{
char c;
cin >> c;
if (c == 'a')
{
int x;
cin >> x;
push(s, x);
}
if (c == 'b')
{
cout << pop(s) << " ";
}
if (c == 'c')
{
cout << getSize(s) << " ";
}
if (c == 'd')
{
cout << getTop(s) << " ";
}
}
cout << endl;
}
return 0;
}
// } Driver Code Ends
/*You are required to complete below methods*/
/*the function pushes an element
x into the stack s */
void push(stack<int> &s, int x)
{
s.push(x);
}
/*pops the top element of the
stack and returns it */
int pop(stack<int> &s)
{
if (s.size() > 0)
{
int res = s.top();
s.pop();
return res;
}
return -1;
}
/*returns the size of the stack */
int getSize(stack<int> &s)
{
return s.size();
}
/*returns the top element
of the stack */
int getTop(stack<int> &s)
{
if (s.size() > 0)
{
return s.top();
}
return -1;
}