CSES - Aalto Competitive Programming 2026 - wk1 - Mon

Submission details
Task:	Babaza Game
Sender:	aalto26am_033
Submission time:	2026-08-31 17:37:20 +0300
Language:	Scala
Status:	READY
Result:	RUNTIME ERROR

Test results
test	verdict	time
#1	RUNTIME ERROR	0.72 s	details
#2	RUNTIME ERROR	0.72 s	details
#3	RUNTIME ERROR	0.72 s	details
#4	RUNTIME ERROR	0.72 s	details
#5	RUNTIME ERROR	0.73 s	details
#6	RUNTIME ERROR	0.74 s	details
#7	RUNTIME ERROR	0.73 s	details
#8	RUNTIME ERROR	0.74 s	details
#9	RUNTIME ERROR	0.72 s	details
#10	RUNTIME ERROR	0.72 s	details
#11	RUNTIME ERROR	0.73 s	details
#12	RUNTIME ERROR	0.73 s	details
#13	RUNTIME ERROR	0.72 s	details
#14	RUNTIME ERROR	0.73 s	details

Compiler report

warning: there were two deprecation warnings; re-run with -deprecation for details
one warning found

Code

object Sum {
    def main(args: Array[String]): Unit = {
        val a = readLine
        val b = readLine
        val freeChars = 'A'.to('Z').toSet.diff(a.toCharArray.toSet.union(b.toCharArray.toSet))
        println(a)
        println(
            a.zipWithIndex.map(a =>
                if ((a._2%2)==1) {freeChars.head} else {a._1}
            ).mkString
        )
        println(
            b.zipWithIndex.map(a =>
                if ((a._2%2)==1) {freeChars.head} else {a._1}
            ).mkString
        )
        println(b)
    }
}

Test details

Test 1

Verdict: RUNTIME ERROR

input
`A B` view save

correct output
`A B` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 2

Verdict: RUNTIME ERROR

input
`BABAZA BACBCB` view save

correct output
`BABAZA BACACA BACBCB` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 3

Verdict: RUNTIME ERROR

input
`AB BA` view save

correct output
`AB CB CA BA` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 4

Verdict: RUNTIME ERROR

input
`ABC BCD` view save

correct output
`ABC DBD DCD BCD` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 5

Verdict: RUNTIME ERROR

input
`AXYB CXYD` view save

correct output
`AXYB CXYD` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 6

Verdict: RUNTIME ERROR

input
`LMIJLF PAQBMH` view save

correct output
`LMIJLF PMQJMF PAQBMH` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 7

Verdict: RUNTIME ERROR

input
`PNIWLSLIH CRLVPUFHD` view save

correct output
`PNIWLSLIH CNLWPSFID CRLVPUFHD` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 8

Verdict: RUNTIME ERROR

input
`ZDYIAVTKL ZJKVXGAUM` view save

correct output
`ZDYIAVTKL ZJYVAGTUL ZJKVXGAUM` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 9

Verdict: RUNTIME ERROR

input
`FBIXISJH NXZIESMG` view save

correct output
`FBIXISJH NBZXESMH NXZIESMG` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 10

Verdict: RUNTIME ERROR

input
`OPGW QJIE` view save

correct output
`OPGW QPIW QJIE` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 11

Verdict: RUNTIME ERROR

input
`DUKNPKQZBL NZPBMOEBIC` view save

correct output
`DUKNPKQZBL NUPNMKEZIL NZPBMOEBIC` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 12

Verdict: RUNTIME ERROR

input
`ZWDTX HZOXI` view save

correct output
`ZWDTX HWOTI HZOXI` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 13

Verdict: RUNTIME ERROR

input
`URJF ITIQ` view save

correct output
`URJF IRIF ITIQ` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Test 14

Verdict: RUNTIME ERROR

input
`WYWBWU IRYVBA` view save

correct output
`WYWBWU WRWVWA IRYVBA` view save

user output
(empty)

Error:

java.lang.ClassNotFoundException: Main
	at scala.reflect.internal.util.ScalaClassLoader$class.run(ScalaClassLoader.scala:63)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:101)
	at scala.tools.nsc.CommonRunner$class.run(ObjectRunner.scala:22)
	at scala.tools.nsc.JarRunner$.run(MainGenericRunner.scala:13)
	at scala.tools.nsc.CommonRunner$class.runAndCatch(ObjectRunner.scala:29)
	at scala.tools.nsc.JarRunner$.runJar(MainGenericRunner.scala:25)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:69)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:87)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:98)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)

Aalto Competitive Programming 2026 - wk1 - Mon

Babaza Game

Compiler report

Code

Test details

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Test 7

Test 8

Test 9

Test 10

Test 11

Test 12

Test 13

Test 14

Tasks

Submissions (aalto26am_033)