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Practice › LeetCode › LeetCode 01xx ›

LeetCode 193 - Valid Phone Numbers

LeetCode Problem 193 Difficulty: 🟢 Easy Topics: Shell Solution Problem Understanding This problem asks us to process a text file named file.txt and print only the phone numbers that match one of two valid formats. The valid formats are: xxx-xxx-xxxx and (xxx) xxx-xxxx In both formats, every x represents a single digit from 0 to 9 . The task is not to transform the input or extract partial matches. Instead,...
leetcode Easy shell May 27, 2026
Practice › LeetCode › LeetCode 01xx ›

LeetCode 195 - Tenth Line

LeetCode Problem 195 Difficulty: 🟢 Easy Topics: Shell Solution Problem Understanding This problem asks us to print exactly the 10th line from a text file named file.txt . The file contains multiple lines of plain text, and each line is separated by a newline character. The input is not provided as function arguments like many algorithm problems. Instead, the solution must work directly with a file in a shell scripting...
leetcode Easy shell May 27, 2026
Practice › LeetCode › LeetCode 01xx ›

LeetCode 194 - Transpose File

LeetCode Problem 194 Difficulty: 🟡 Medium Topics: Shell Solution Problem Understanding This problem asks us to transpose the contents of a text file. Transposing means converting rows into columns and columns into rows. Every word in the input file is separated by a single space, and each row contains the same number of columns. The input is a file named file.txt . Each line in the file represents a row...
leetcode Medium shell May 27, 2026
Practice › LeetCode › LeetCode 01xx ›

LeetCode 192 - Word Frequency

LeetCode Problem 192 Difficulty: 🟡 Medium Topics: Shell Solution Problem Understanding This problem asks us to write a shell script that reads a text file named words.txt and computes how many times each word appears. After counting the occurrences, the script must print every unique word together with its frequency, sorted in descending order of frequency. The input is represented as a plain text file rather than function arguments. The...
leetcode Medium shell May 27, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 195: Tenth Line

Problem Restatement We are given a text file named file.txt . We need to print only the tenth line of the file. If the file has fewer than ten lines, the script should print nothing. Example input: Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 Line 10 Expected output: Line 10 Input and Output Item Meaning Input A file named...
leetcode shell bash awk sed head tail May 12, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 194: Transpose File

Problem Restatement We are given a text file named file.txt . Each line contains several words separated by spaces. We need to transpose the file. That means: The first column becomes the first row. The second column becomes the second row. The third column becomes the third row. And so on. Example input: name age alice 21 ryan 30 Expected output: name alice ryan age 21 30 The original rows...
leetcode shell bash awk May 12, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 193: Valid Phone Numbers

Problem Restatement We are given a text file named file.txt . Each line contains one phone number candidate. We need to print only the valid phone numbers. A valid phone number must match one of these two formats: xxx-xxx-xxxx or: (xxx) xxx-xxxx Here, each x is a digit. For example: 987-123-4567 123 456 7890 (123) 456-7890 The valid lines are: 987-123-4567 (123) 456-7890 Input and Output Item Meaning Input A...
leetcode shell bash grep regex May 12, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 192: Word Frequency

Problem Restatement We are given a text file named words.txt . We need to write a Bash script that counts how many times each word appears in the file. The output should show each word followed by its frequency, sorted from highest frequency to lowest frequency. The problem assumes that: Rule Meaning Characters The file contains only lowercase letters and spaces Words Each word contains lowercase letters only Separators Words...
leetcode shell bash sort uniq awk May 12, 2026