feat(shell): LeetCode 194 - ファイル転置問題のBash解法を追加#239
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…pose File Implement multiple approaches for file transposition with detailed explanations: - Basic 2D array approach using awk (Runtime: 72ms, Memory: 7.82MB) - Optimized string concatenation method (Runtime: 59-67ms, Memory: 3.99MB) - Alternative paste command approach (Runtime: 269ms, Memory: 3.59MB) Key improvements: - Reduced memory usage by 50% using 1D array instead of 2D - Improved runtime by 18-30% through efficient string concatenation - Added detailed visual diagrams explaining the transposition algorithm - Included performance analysis and complexity comparisons Performance highlights: - Best solution: 59ms runtime (Beats 93.40%), 3.99MB memory (Beats 91.05%) - Optimized for both competitive programming and production use cases
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📝 WalkthroughSummary by CodeRabbit
✏️ Tip: You can customize this high-level summary in your review settings. Walkthrough新しいJupyterノートブック「TransposeFile.ipynb」が追加され、テキストファイルを転置するBash/awkベースのソリューションについて説明しています。複数のアプローチ、実装例、パフォーマンス分析が含まれています。 Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Poem
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myoshi2891
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Actionable comments posted: 3
🤖 Fix all issues with AI agents
In `@Shell/Bash/Leetcode/194`. Transpose File/TransposeFile.ipynb:
- Around line 378-381: The cols calculation using head -1 undercounts when the
first line has fewer fields; replace the head-based assignment for the variable
cols with a computation of the maximum number of fields across all lines (use
awk to compute max NF and assign that to cols), then keep the existing seq/for
loop and cut -f$i ... | paste -sd' ' pipeline unchanged so the loop iterates up
to the true maximum column count.
- Around line 349-369:
ワンライナーと可読版のAWKがENDでNFを使っているため最終行が短いと列が欠落します。awkスクリプト内でNFを見て最大列数を追跡する変数（例: max や
m）を導入し、各レコード処理中に if (NF > max) max = NF を設定してから、END ブロックのループで NF
の代わりにその最大値（max）を使って a[i] を出力するように修正してください（参照箇所: NF, NR, a[i], END）。
- Around line 241-257: The awk script uses NF in the END block which can drop
columns if the last input line has fewer fields; modify the per-record block to
track the maximum field count (e.g., update a maxNF variable each record: maxNF
= (NF>maxNF? NF:maxNF)) while still building a[i] for each field, initialize
maxNF to 0, and then in the END block iterate i from 1 to maxNF (not NF) to
print a[i]; reference the existing NR, NF, a[i], and END logic when applying
this change.
Comment on lines
+241
to
+257
| "awk '\n", | ||
| "{\n", | ||
| " for (i = 1; i <= NF; i++) {\n", | ||
| " if (NR == 1) {\n", | ||
| " # 最初の行: 配列を初期化\n", | ||
| " a[i] = $i\n", | ||
| " } else {\n", | ||
| " # 2行目以降: スペース区切りで連結\n", | ||
| " a[i] = a[i] \" \" $i\n", | ||
| " }\n", | ||
| " }\n", | ||
| "}\n", | ||
| "END {\n", | ||
| " for (i = 1; i <= NF; i++) {\n", | ||
| " print a[i]\n", | ||
| " }\n", | ||
| "}\n", |
Contributor
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最終行の列数に依存して出力列が欠落する可能性があります。
END で NF を使うと「最終行が短い」ケースで列が抜けます。読み込み時に最大列数を追跡して END ではその値を使うのが安全です（列が後から増えるケースにも対応）。
🐛 修正案（最大列数を追跡）
-awk '
-{
- for (i = 1; i <= NF; i++) {
- if (NR == 1) {
- # 最初の行: 配列を初期化
- a[i] = $i
- } else {
- # 2行目以降: スペース区切りで連結
- a[i] = a[i] " " $i
- }
- }
-}
-END {
- for (i = 1; i <= NF; i++) {
- print a[i]
- }
-}
-' file.txt
+awk '
+{
+ if (NF > p) p = NF
+ for (i = 1; i <= NF; i++) {
+ if (i in a) {
+ a[i] = a[i] " " $i
+ } else {
+ a[i] = $i
+ }
+ }
+}
+END {
+ for (i = 1; i <= p; i++) {
+ if (i in a) print a[i]
+ }
+}
+' file.txt🤖 Prompt for AI Agents
In `@Shell/Bash/Leetcode/194`. Transpose File/TransposeFile.ipynb around lines 241
- 257, The awk script uses NF in the END block which can drop columns if the
last input line has fewer fields; modify the per-record block to track the
maximum field count (e.g., update a maxNF variable each record: maxNF =
(NF>maxNF? NF:maxNF)) while still building a[i] for each field, initialize maxNF
to 0, and then in the END block iterate i from 1 to maxNF (not NF) to print
a[i]; reference the existing NR, NF, a[i], and END logic when applying this
change.
Comment on lines
+349
to
+369
| "awk '{for(i=1;i<=NF;i++)a[i]=a[i](NR>1?\" \":\"\")$i}END{for(i=1;i<=NF;i++)print a[i]}' file.txt\n", | ||
| "\n", | ||
| "# 方法2: 可読性重視版\n", | ||
| "# Analyze Complexity\n", | ||
| "# Runtime 67 ms\n", | ||
| "# Beats 53.43%\n", | ||
| "# Memory 3.98 MB\n", | ||
| "# Beats 91.05%\n", | ||
| "\n", | ||
| "awk '\n", | ||
| "{\n", | ||
| " for (i = 1; i <= NF; i++) {\n", | ||
| " a[i] = a[i] (NR > 1 ? \" \" : \"\") $i\n", | ||
| " }\n", | ||
| "}\n", | ||
| "END {\n", | ||
| " for (i = 1; i <= NF; i++) {\n", | ||
| " print a[i]\n", | ||
| " }\n", | ||
| "}\n", | ||
| "' file.txt\n", |
Contributor
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🧹 Nitpick | 🔵 Trivial
ワンライナー/可読版ともに NF 依存で列欠落のリスクがあります。
Line 349 のワンライナーと Line 358-366 の可読版どちらも END で NF を使っており、最終行が短い場合に列が落ちます。最大列数を追跡して END に使う構成へ揃えることを推奨します。
♻️ 可読版の修正例（ワンライナーにも同様に適用）
-awk '
-{
- for (i = 1; i <= NF; i++) {
- a[i] = a[i] (NR > 1 ? " " : "") $i
- }
-}
-END {
- for (i = 1; i <= NF; i++) {
- print a[i]
- }
-}
-' file.txt
+awk '
+{
+ if (NF > p) p = NF
+ for (i = 1; i <= NF; i++) {
+ a[i] = (i in a) ? a[i] " " $i : $i
+ }
+}
+END {
+ for (i = 1; i <= p; i++) {
+ if (i in a) print a[i]
+ }
+}
+' file.txt📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
Suggested change
| "awk '{for(i=1;i<=NF;i++)a[i]=a[i](NR>1?\" \":\"\")$i}END{for(i=1;i<=NF;i++)print a[i]}' file.txt\n", | |
| "\n", | |
| "# 方法2: 可読性重視版\n", | |
| "# Analyze Complexity\n", | |
| "# Runtime 67 ms\n", | |
| "# Beats 53.43%\n", | |
| "# Memory 3.98 MB\n", | |
| "# Beats 91.05%\n", | |
| "\n", | |
| "awk '\n", | |
| "{\n", | |
| " for (i = 1; i <= NF; i++) {\n", | |
| " a[i] = a[i] (NR > 1 ? \" \" : \"\") $i\n", | |
| " }\n", | |
| "}\n", | |
| "END {\n", | |
| " for (i = 1; i <= NF; i++) {\n", | |
| " print a[i]\n", | |
| " }\n", | |
| "}\n", | |
| "' file.txt\n", | |
| "awk '{for(i=1;i<=NF;i++)a[i]=a[i](NR>1?\" \":\"\")$i}END{for(i=1;i<=NF;i++)print a[i]}' file.txt\n", | |
| "\n", | |
| "# 方法2: 可読性重視版\n", | |
| "# Analyze Complexity\n", | |
| "# Runtime 67 ms\n", | |
| "# Beats 53.43%\n", | |
| "# Memory 3.98 MB\n", | |
| "# Beats 91.05%\n", | |
| "\n", | |
| "awk '\n", | |
| "{\n", | |
| " if (NF > p) p = NF\n", | |
| " for (i = 1; i <= NF; i++) {\n", | |
| " a[i] = (i in a) ? a[i] \" \" $i : $i\n", | |
| " }\n", | |
| "}\n", | |
| "END {\n", | |
| " for (i = 1; i <= p; i++) {\n", | |
| " if (i in a) print a[i]\n", | |
| " }\n", | |
| "}\n", | |
| "' file.txt\n", |
🤖 Prompt for AI Agents
In `@Shell/Bash/Leetcode/194`. Transpose File/TransposeFile.ipynb around lines 349
- 369, ワンライナーと可読版のAWKがENDでNFを使っているため最終行が短いと列が欠落します。awkスクリプト内でNFを見て最大列数を追跡する変数（例:
max や m）を導入し、各レコード処理中に if (NF > max) max = NF を設定してから、END ブロックのループで NF
の代わりにその最大値（max）を使って a[i] を出力するように修正してください（参照箇所: NF, NR, a[i], END）。
Comment on lines
+378
to
+381
| "cols=$(head -1 file.txt | wc -w)\n", | ||
| "for i in $(seq 1 $cols); do\n", | ||
| " cut -d' ' -f$i file.txt | paste -sd' '\n", | ||
| "done" |
Contributor
There was a problem hiding this comment.
head -1 による列数取得は先頭行が短いと列が欠落します。
列数は全行の最大値で決めるのが安全です。awk で最大 NF を取ってから seq へ渡す形にすると漏れません。
🐛 修正案（最大列数を算出）
-cols=$(head -1 file.txt | wc -w)
+cols=$(awk '{if (NF>m) m=NF} END {print m}' file.txt)
for i in $(seq 1 $cols); do
cut -d' ' -f$i file.txt | paste -sd' '
done📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
Suggested change
| "cols=$(head -1 file.txt | wc -w)\n", | |
| "for i in $(seq 1 $cols); do\n", | |
| " cut -d' ' -f$i file.txt | paste -sd' '\n", | |
| "done" | |
| "cols=$(awk '{if (NF>m) m=NF} END {print m}' file.txt)\n", | |
| "for i in $(seq 1 $cols); do\n", | |
| " cut -d' ' -f$i file.txt | paste -sd' '\n", | |
| "done" |
🤖 Prompt for AI Agents
In `@Shell/Bash/Leetcode/194`. Transpose File/TransposeFile.ipynb around lines 378
- 381, The cols calculation using head -1 undercounts when the first line has
fewer fields; replace the head-based assignment for the variable cols with a
computation of the maximum number of fields across all lines (use awk to compute
max NF and assign that to cols), then keep the existing seq/for loop and cut
-f$i ... | paste -sd' ' pipeline unchanged so the loop iterates up to the true
maximum column count.
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ファイル転置のための複数のアプローチを詳細な図解付きで実装:
主な改善点:
パフォーマンスハイライト: