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Task/Find-the-missing-permutation/ERRE/find-the-missing-permutation.erre

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+PROGRAM MISSING
+
+CONST N=4
+
+DIM PERMS$[23]
+
+BEGIN
+  PRINT(CHR$(12);) ! CLS
+  DATA("ABCD","CABD","ACDB","DACB","BCDA","ACBD","ADCB")
+  DATA("CDAB","DABC","BCAD","CADB","CDBA","CBAD","ABDC","ADBC")
+  DATA("BDCA","DCBA","BACD","BADC","BDAC","CBDA","DBCA","DCAB")
+
+  FOR I%=1 TO UBOUND(PERMS$,1) DO
+    READ(PERMS$[I%])
+  END FOR
+
+  SOL$="...."
+
+  FOR I%=1 TO N DO
+    CH$=CHR$(I%+64)
+    COUNT%=0
+    FOR Z%=1 TO N DO
+       COUNT%=0
+       FOR J%=1 TO UBOUND(PERMS$,1) DO
+          IF CH$=MID$(PERMS$[J%],Z%,1) THEN COUNT%=COUNT%+1 END IF
+       END FOR
+       IF COUNT%<>6 THEN
+           !$RCODE="MID$(SOL$,Z%,1)=CH$"
+       END IF
+    END FOR
+  END FOR
+  PRINT("Solution is: ";SOL$)
+END PROGRAM