제출 #71714

5 4 4
3 5
5 1
2 3
1 2

런타임 에러 (RTE)
stderr:
 Exception in thread "main" java.lang.StringIndexOutOfBoundsException: index -1, length 0
	at java.base/java.lang.String.checkIndex(String.java:4565)
	at java.base/java.lang.AbstractStringBuilder.deleteCharAt(AbstractStringBuilder.java:970)
	at java.base/java.lang.StringBuilder.deleteCharAt(StringBuilder.java:298)
	at Main.main(Main.java:43)

4 
4 

4 5 1
1 2
1 3
1 4
2 4
3 4

런타임 에러 (RTE)
stderr:
 Exception in thread "main" java.lang.StringIndexOutOfBoundsException: index -1, length 0
	at java.base/java.lang.String.checkIndex(String.java:4565)
	at java.base/java.lang.AbstractStringBuilder.deleteCharAt(AbstractStringBuilder.java:970)
	at java.base/java.lang.StringBuilder.deleteCharAt(StringBuilder.java:298)
	at Main.main(Main.java:43)

1 2 4 3 
1 2 3 4 

4 5 2
3 1
1 2
4 3
1 4
3 2

런타임 에러 (RTE)
stderr:
 Exception in thread "main" java.lang.StringIndexOutOfBoundsException: index -1, length 0
	at java.base/java.lang.String.checkIndex(String.java:4565)
	at java.base/java.lang.AbstractStringBuilder.deleteCharAt(AbstractStringBuilder.java:970)
	at java.base/java.lang.StringBuilder.deleteCharAt(StringBuilder.java:298)
	at Main.main(Main.java:43)

2 1 3 4 
2 1 3 4