Mean of while (t--) in line 12

#1

mean of while (t–) in line 12

#2

hum yaha pr har jagah .first and .secomd kkre hai so yeh kya predefined hai .first and . second

#3

while(t–) is for the test cases. You need to work for each test case. This is why you make this while loop.
Yes first and second is predefined for pair. It must be taught in the STL section of your course.

#4

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