Comments
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I guess you forget to add header files

import java.util.*
+4

I cant find any courses that tell me how to read a string or read input one by one:(
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   val (x, y) = readLine()!!.split(' ').map(String::toInt)

this can solve the first problem,but i dont know how to read a string :(
On Errichto → Codeforces Round #356, 10 years ago
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18317238

I hate 93 :(
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I guess Input and Output were mutually misplaced?

I need to Input '<=' and '>' and let computer to guess and Output the number?