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Task/Range-extraction/Phix/range-extraction.phix

@@ -0,0 +1,26 @@
+function spout(integer first, integer this, sequence s)
+string res
+    if first=this-1 then
+        res = sprintf("%d",s[first])
+    else
+        res = sprintf("%d%s%d",{s[first],iff(first=this-2?',':'-'),s[this-1]})
+    end if
+    return res
+end function
+
+function extract_ranges(sequence s)
+integer first = 1
+string out = ""
+    if length(s)!=0 then
+        for i=2 to length(s) do
+            if s[i]!=s[i-1]+1 then
+                out &= spout(first,i,s)&','
+                first = i
+            end if
+        end for
+        out &= spout(first,length(s)+1,s)
+    end if
+    return out
+end function
+
+puts(1,extract_ranges({0,1,2,4,6,7,8,11,12,14,15,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,32,33,35,36,37,38,39}))