C :

#include<stdio.h>
#include<string.h>
int main()
{
	int T;
    scanf("%d",&T);
    while(T--)
	{
		int s=1,M,n,time,t=0;
        char c[5];
        scanf("%d",&M);
        getchar();
        while(M--)
		{
			scanf("%s",c);
            n=strlen(c);
            if(n==2)
				s*=20;
            if(n==4){
				scanf("%d",&time);
                t+=time*60/s;
             }
             if(n==3)
                s/=20;
         }
         printf("%d\n",t);
	}
    return 0;
}

C++ :

#include<iostream>
 #include<string>
 using namespace std;
 int main()
 {
 int n,m,count=0;
 double time=0.0,num;
 int rate(int);
 string s;
 cin>>n;
 while(n--)
 {
 cin>>m;
 while(m--)
 {
 cin>>s;
 if(s=="IN")
 count++;
 else if(s=="OUT")
 count--;
 else
 {
 cin>>num;
 time=time+num/rate(count);

 }

 }
 cout<<time*60<<endl;
 time=0;
 s="";
 }
 return 0;
 }
 int rate(int x)
 {
 int a=1;
 while(x--)
 {
 a=a*20;
 }
 return a;
 }

Java :

import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		int T=sc.nextInt();
		while(T-->0)
		{
			int M=sc.nextInt();
			int realTimes=0;
			int stayTimes=0;
			int floor=0;
			while(M-->0)
			{
				String str=sc.next();
				if(str.equals("IN")){
					floor++;
				}else if(str.equals("STAY")){
					stayTimes=sc.nextInt();
					stayTimes*=60;
					realTimes+=stayTimes/(int)Math.pow(20,floor);
				}else{
					floor--;
				}
			}
			System.out.println(realTimes);
		}
	}
}