stack algorithm in c 2b 2b

1#include <bits/stdc++.h> 
2
3stack<int> stk;
4stk.push(5);
5int ans = stk.top(5); // ans =5
6stk.pop();//removes 5

1#include<iostream.h>
2#include<conio.h>
3#include<stdlib.h>
4class stack

1#take input 2D vector
2
3vector<vector<int> > v;
4for(int i=0;i<n;i++){
5for(int j=0;j<m;j++){
6v[i].push_back(data);
7}}