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reverse stack.cpp
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reverse stack.cpp
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/*
///////////////////////////////////////////
//Question/Info
reverse a stack using recursion
author: srj_v
///////////////////////////////////////////
*/
#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define setbits(x) __builtin_popcount(x)
#define pb(x) push_back(x)
#define mp(x,y) make_pair(x,y)
#define eb(x) emplace_back(x)
#define ct(x) cout << x << endl;
#define ct2(x,y) cout << x << " " << y << endl;
#define forn(i,n) for(int i = 0; i < (int)(n); ++i)
#define forx(i,x,n) for(int i = x; i < (int)(n); ++i)
#define nfor(i,n) for(int i = n-1; i >= 0; --i)
#define all(v) v.begin(),v.end()
#define fsp(x,y) fixed << setprecision(y) << x;
#define PI 3.1415926535897932384626433832795
#define MOD 1000000007 // (1e9+7)
#define pii pair<int,int>
#define pis pair<int,string>
#define vi vector<int>
#define vii vector<pii>
#define mii map<int,int>
#define p_q priority_queue // priority_queue<int> (&) priority_queue< int,vi,greater<int> >
#define _IOS ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
typedef long double ld;
#pragma GCC optimize("Ofast")
void c_p_c()
{
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
}
void inss(stack<int>&st, int ele) {
if (st.size() == 0) {
st.push(ele);
return ;
}
int temp = st.top();
st.pop();
inss(st, ele);
st.push(temp);
return;
}
void rev(stack<int>&st)
{
if (st.size() == 1) {
return ;
}
int temp = st.top();
st.pop();
rev(st);
inss(st, temp);
return;
}
int32_t main() {
///////////
c_p_c();
///////////
_IOS
//////////
// code
/*
int t ; cin >> t; while(t--){}
*/
stack<int> st ;
st.push(5);
st.push(4);
st.push(3);
st.push(2);
st.push(1);
rev(st);
while (!st.empty()) {
cout << st.top() << " ";
st.pop();
}
// cerr << "time: " << clock() << " ms" << '\n';
return 0;
}