HackerRank Paste – 4 problem solution

In this HackerRank Paste – 4 problem solution we have given a CSV file where each row contains the name of a city and its state separated by a comma, your task is to restructure the file in such a way, that three consecutive rows are folded into one, and separated by a tab.

Input Format

You are given a CSV file where each row contains the name of a city and its state separated by a comma.

Output Format

Restructure the file in such a way, that every group of three consecutive rows are folded into one, and separated by tab.

Sample Input

Albany, N.Y.

Albuquerque, N.M.

Anchorage, Alaska

Asheville, N.C.

Atlanta, Ga.

Atlantic City, N.J.

Austin, Texas

Baltimore, Md.

Baton Rouge, La.

Billings, Mont.

Birmingham, Ala.

Bismarck, N.D.

Boise, Idaho

Boston, Mass.

Bridgeport, Conn.

Sample Output

Albany, N.Y.    Albuquerque, N.M.   Anchorage, Alaska

Asheville, N.C. Atlanta, Ga.    Atlantic City, N.J.

Austin, Texas   Baltimore, Md.  Baton Rouge, La.

Billings, Mont. Birmingham, Ala.    Bismarck, N.D.

Boise, Idaho    Boston, Mass.   Bridgeport, Conn.

Explanation

The given input file has been reshaped as required.

Problem solution.

paste - - - 

Second solution.

paste -d$'t' - - -

Third solution.

i=1
while read line
do
    if [ $i -eq 3 ]; then
        echo -e "t$line"
        i=1
    elif [ $i -eq 1 ]; then
        echo -n "$line"
        ((i++))
    else
        echo -en "t$line"
        ((i++))
    fi
done

Fourth solution.

paste -d't' - - -