WA in LIFTME , please tell what am i missing

help
, ,
1 
from sys import stdin, stdout  

t=int(stdin.readline())
while t:
t-=1
arr=[]
n,q=map(int, stdin.readline().split())
for i in range(q):
    x=list(map(int, stdin.readline().split()))
    arr.append(x)
s=0

for i in range(len(arr)):
    if i==0:
        s+=abs(arr[0][1])
    else:
        s+=abs(arr[i][1]-arr[i][0])
        s+=abs(arr[i-1][1]-arr[i][0])
print(arr)
stdout.write(str(s))
2

Could you please explain your approach also So that the one who dont know python can figure out?

3

Hi @sagar7742. Here is the modified version of your code.

# cook your dish here
from sys import stdin, stdout  

t=int(stdin.readline())
while t:
    t-=1
    arr=[]
    n,q=map(int, stdin.readline().split())
    for i in range(q):
        x=list(map(int, stdin.readline().split()))
        arr.append(x)
    s=0
    for i in range(len(arr)):
        if i==0:
            s+=(arr[0][0])+abs(arr[0][1]-arr[0][0])
        else:
            s+=abs(arr[i][1]-arr[i][0])
            s+=abs(arr[i-1][1]-arr[i][0])
    #print(arr)
    stdout.write(str(s)+"\n")

The following were the corrections I made in the code:

  1. Indented the code after while loop (Don’t know if it is copy-paste error)
  2. Commented the print(arr) line from second to last. You don’t want to be prinitng the whole array in the output.
  3. For the first request, we need to add the source floor’s distance from ground floor i.e. add arr[0][0] to s as well as the abosulte difference between the destination and source of the first request i.e. abs(arr[0][1]-arr[0][0]).
  4. Added a "\n" to stdout.write since it does not create a newline automatically after every operation.

Cheers :slight_smile:

4

Thanks @krish_na I indeed was missing the “\n” part…rest all errors were corrected. :smiley:

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