"John:I'm in 1st position." and "Tom:I'm in 1st position." contradicts therefore John OR Tom is Mr Wrong and Peter is a Mr Right.

"Peter:I'm in 2nd position." and "Peter:The man in front of me is Tom." we've deduced that Peter is a Mr Right therefore these statements are truthy and supports Tom but contradicts Johns statement hence John is Mr Wrong.

Huh, my solution didn't detect Mr. Wrong this way, maybe that's why I'm still failing sometimes.

Just tried your solution a couple of times. How many of those hours did you spend clicking the submit button? x)

I haven't thoroughly investigated but looking back at my solution I think it's because in any of the possible queues, there's no queue where Icrko is Mr Wrong and everyone else is Mr Right, but there is a queue where Gbnt is Mr Wrong and everyone else is Mr Right.

Oh, if your confusion is creating a "correct value", you can have a single 0 as a correct value

No leading zeroes (but a single zero in the rightmost digit is allowed).

The dead segment could be any of the segments that are currently "on". The segment "a" could be a dead segment with its dead "type" being "on", so could "b", "c".. etc

(This hint might be spoilery)

The answer is 'c1' because if you compare the two numbers that are displayed (6 and 1) you notice that each segment except 'c1' is "switchable"