How to resolve the algorithm Range extraction step by step in the Tcl programming language

Published on 12 May 2024 09:40 PM
#Tcl

How to resolve the algorithm Range extraction step by step in the Tcl programming language

Table of Contents

Problem Statement

A format for expressing an ordered list of integers is to use a comma separated list of either Example The list of integers: Is accurately expressed by the range expression: (And vice-versa).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Range extraction step by step in the Tcl programming language

Source code in the tcl programming language

proc rangeExtract list {
    set result [lindex $list 0]
    set first [set last [lindex $list 0]]
    foreach term [lrange $list 1 end] {
	if {$term == $last+1} {
	    set last $term
	    continue
	}
	if {$last > $first} {
	    append result [expr {$last == $first+1 ? "," : "-"}] $last
	}
	append result "," $term
	set first [set last $term]
    }
    if {$last == $first+1} {
	append result "," $last
    } elseif {$last > $first} {
	append result "-" $last
    }
    return $result
}

# Commas already removed so it is a natural Tcl list
puts [rangeExtract {
    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
}]

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