trains is a list that contains information about trains associated with a station stn. Specifically, each element in this list is a pair: [Arrival, Departure]. If the arrival or departure time is empty, it is represented as "None". 1 flag1 = False, flag2 = True 2 count = 0 3 foreach x in trains{ 4 if(first(x) == "None" or last(x) == "None"){ 5 flag1 = True 6 } 7 else{ 8 count = count + 1 9 } 10 } 11 if(count == length(trains)){ 12 flag2 = False 13 } Based on the above data, answer the given subquestions. Which of the following statements about the variable flag1 is True at the end of execution of the given pseudocode?

(A) It is True if and only if stn is a starting or ending station for at least one train in the list

(B) It is False if and only if stn is a starting or ending station for at least one train in the list

(C) It is True if and only if stn is a starting station for one train and ending station for some other train in the list

(D) It is False if and only if stn is a starting station for one train and ending station for some other train in the list

Computational Thinking · End Term · 30 Apr 2023 · January 2023 term · Set QPF1-S2

Question 18: trains is a list that contains information about trains …

Question 18

+3 marksOne correct option

trains is a list that contains information about trains associated with a station stn. Specifically, each element in this list is a pair: [Arrival, Departure]. If the arrival or departure time is empty, it is represented as "None".

text

1 1  flag1 = False, flag2 = True
2 2  count = 0
3 3  foreach x in trains{
4 4      if(first(x) == "None" or last(x) == "None"){
5 5          flag1 = True
6 6      }
7 7      else{
8 8          count = count + 1
9 9      }
1010  }
1111  if(count == length(trains)){
1212      flag2 = False
1313  }

Based on the above data, answer the given subquestions.

Which of the following statements about the variable flag1 is True at the end of execution of the given pseudocode?

A
It is True if and only if stn is a starting or ending station for at least one train in the list
B
It is False if and only if stn is a starting or ending station for at least one train in the list
C
It is True if and only if stn is a starting station for one train and ending station for some other train in the list
D
It is False if and only if stn is a starting station for one train and ending station for some other train in the list

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Correct answer

A
It is True if and only if stn is a starting or ending station for at least one train in the list

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Question 18 of 25 in the IIT Madras BS Computational Thinking (Computational Thinking (CT)) End Term paper sat on 30 Apr 2023, in the January 2023 term (IIT M FOUNDATION ET1 EXAM QPF1 S2 30 Apr 2023). It carries 3 marks.

Question 18: trains is a list that contains information about trains …

Question 18

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