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Task/Five-weekends/Phix/five-weekends.phix

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+sequence m31 = {"January",0,"March",0,"May",0,"July","August",0,"October",0,"December"}
+integer y,m,
+        nmonths = 0
+string months
+sequence res = {},
+         none = {}
+
+for y=1900 to 2100 do
+    months = ""
+    for m=1 to 12 do
+        if string(m31[m])
+        and day_of_week(y,m,1)=6 then
+            if length(months)!=0 then months &= ", " end if
+            months &= m31[m]
+            nmonths += 1
+        end if
+    end for
+    if length(months)=0 then
+        none = append(none,y)
+    else
+        res = append(res,sprintf("%d : %s\n",{y,months}))
+    end if
+end for
+
+printf(1,"Found %d months with five full weekends\n",nmonths)
+res[6..-6] = {" ...\n"}
+puts(1,join(res,""))
+printf(1,"Found %d years with no month having 5 weekends:\n",{length(none)})
+none[6..-6] = {".."}
+?none