Countdown timer using LC3 Assembly Langugae

558fe5180e0e8fc922d31c23ef84d240

I want to make a timer that will countdown from a number that a user will give such as 20 min. If it is easier I could use the timer as a set amount each time. I want the timer to countdown from 20:00 down to 00:00 (min:sec). I want users to be able to pause and start the time by pressing a s for start and a p for pause. If you have any questions let me know, any help will be greatly appreciated.

May I Know where is my mistake

558fe5180e0e8fc922d31c23ef84d240
#include<iostream>
using namespace std;
int main()
{
  string weekday;
  weekday= {"Mon","Tue","Wed", "Thu","Fri"};
  cout<<"\n Please select day of booking:";
  cin>>weekday;
  cout<<"\n Day of booking:";

  return 0;
}