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Day-005.cpp
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Day-005.cpp
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/*
* This problem was asked by Jane Street.
* cons(a, b) constructs a pair, and car(pair) and cdr(pair) returns the first and last element of that pair.
*
* For example, car(cons(3, 4)) returns 3, and cdr(cons(3, 4)) returns 4.
* Given this implementation of cons:
def cons(a, b):
def pair(f):
return f(a, b)
return pair
* Implement car and cdr.
*
*/
/*
* I have no idea how to solve this one with given function
* so i implemented a c++ function
*
* if you know solution then please share your approach : offamitkumar@gmail.com
*/
#include <bits/stdc++.h>
using namespace std;
pair<int,int>cons(int a, int b){
return make_pair(a,b);
}
int car(pair<int,int>p){
return p.first;
}
int cdr(pair<int,int>p){
return p.second;
}
int main(void){
cout<<car(cons(3,4))<<endl;
cout<<cdr(cons(3,4))<<endl;
}