algorithm-neet-code-top-150-python-visual/visual/0068_text_justification.html at main · kimtth/algorithm-neet-code-top-150-python-visual · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Text Justification - LeetCode 68</title>
    <link rel="stylesheet" href="styles.css">
    <script src="https://d3js.org/d3.v7.min.js"></script>
</head>
<body>
    <div class="container">
        <div class="problem-info">
            <h1><span class="problem-number">#68</span> Text Justification</h1>
            <p>Format text with even spacing to fit exactly maxWidth characters per line.</p>
            <div class="problem-meta">
                <span class="meta-tag">String</span>
                <span class="meta-tag">Simulation</span>
                <span class="meta-tag">Hard</span>
            </div>
            <div class="file-ref">
                📄 Python: <code>python/0068_text_justification/0068_text_justification.py</code>
            </div>

        </div>

        <div class="explanation-panel">
            <h4>🧠 How It Works (Layman's Terms)</h4>
            <p>This algorithm solves the problem <strong>step by step</strong>:</p>
            <ul>
                <li><strong>Understand:</strong> Parse the input data</li>
                <li><strong>Process:</strong> Apply the core logic</li>
                <li><strong>Optimize:</strong> Use efficient data structures</li>
                <li><strong>Return:</strong> Output the computed result</li>
            </ul>
        </div>


        <div class="visualization-section">
            <h3>🎬 Step-by-Step Visualization</h3>
            <div class="controls">
                <button id="stepBtn">Step</button>
                <button id="autoBtn">Auto Run</button>
                <button id="resetBtn">Reset</button>
            </div>
            <svg id="mainSvg" width="800" height="450"></svg>
            <div class="status-message" id="status">Click "Step" to justify text</div>
        </div>

        <div class="code-section">
            <h3>💻 Python Solution</h3>
            <div class="code-block">
                <pre><span class="keyword">def</span> <span class="function">fullJustify</span>(words, maxWidth):
    result, line, line_len = [], [], <span class="number">0</span>

    <span class="keyword">for</span> word <span class="keyword">in</span> words:
        <span class="keyword">if</span> line_len + <span class="function">len</span>(word) + <span class="function">len</span>(line) > maxWidth:
            <span class="comment"># Justify current line</span>
            <span class="keyword">for</span> i <span class="keyword">in</span> <span class="function">range</span>(maxWidth - line_len):
                line[i % <span class="function">max</span>(<span class="function">len</span>(line)<span class="number">-1</span>, <span class="number">1</span>)] += <span class="string">' '</span>
            result.<span class="function">append</span>(<span class="string">''</span>.<span class="function">join</span>(line))
            line, line_len = [], <span class="number">0</span>
        line.<span class="function">append</span>(word)
        line_len += <span class="function">len</span>(word)

    <span class="comment"># Last line: left-justified</span>
    result.<span class="function">append</span>(<span class="string">' '</span>.<span class="function">join</span>(line).<span class="function">ljust</span>(maxWidth))
    <span class="keyword">return</span> result</pre>
            </div>
        </div>
    </div>

    <script>
        const words = ["This", "is", "an", "example", "of", "text", "justification."];
        const maxWidth = 16;

        let wordIdx = 0;
        let currentLine = [];
        let lineLen = 0;
        let result = [];
        let phase = 'collecting';

        const width = 800, height = 450;
        const svg = d3.select("#mainSvg");
        let autoTimer = null, autoRunning = false;

        function draw() {
            svg.selectAll("*").remove();

            svg.append("text").attr("x", width/2).attr("y", 25)
                .attr("text-anchor", "middle").attr("font-weight", "bold")
                .text(`Text Justification (maxWidth = ${maxWidth})`);

            // Words remaining
            svg.append("text").attr("x", 30).attr("y", 60).attr("font-size", "13px")
                .attr("fill", "#666").text("Words:");

            let wx = 90;
            words.forEach((word, idx) => {
                const isProcessed = idx < wordIdx;
                const isCurrent = idx === wordIdx;
                const wordWidth = word.length * 10 + 15;

                svg.append("rect").attr("x", wx).attr("y", 45)
                    .attr("width", wordWidth).attr("height", 25).attr("rx", 4)
                    .attr("fill", isCurrent ? "#fef3c7" : (isProcessed ? "#e0e0e0" : "#e3f2fd"))
                    .attr("stroke", isCurrent ? "#f59e0b" : "#1976d2");

                svg.append("text").attr("x", wx + wordWidth/2).attr("y", 63)
                    .attr("text-anchor", "middle").attr("font-size", "12px")
                    .text(word);

                wx += wordWidth + 5;
            });

            // Current line being built
            svg.append("text").attr("x", 30).attr("y", 110).attr("font-size", "13px")
                .attr("fill", "#666").text("Current Line:");

            svg.append("rect").attr("x", 130).attr("y", 95)
                .attr("width", maxWidth * 12 + 10).attr("height", 30).attr("rx", 5)
                .attr("fill", "#fff").attr("stroke", "#ddd");

            let cx = 135;
            currentLine.forEach((word, idx) => {
                const wordWidth = word.length * 10;
                svg.append("text").attr("x", cx).attr("y", 115)
                    .attr("font-size", "14px").attr("font-family", "monospace")
                    .text(word);
                cx += wordWidth + 12;
            });

            svg.append("text").attr("x", 130 + maxWidth * 12 + 20).attr("y", 115)
                .attr("font-size", "12px").attr("fill", "#666")
                .text(`len: ${lineLen}/${maxWidth}`);

            // Result lines
            svg.append("text").attr("x", 30).attr("y", 160).attr("font-size", "13px")
                .attr("font-weight", "bold").text("Result:");

            result.forEach((line, idx) => {
                const y = 175 + idx * 30;
                svg.append("rect").attr("x", 90).attr("y", y)
                    .attr("width", maxWidth * 10 + 10).attr("height", 25).attr("rx", 4)
                    .attr("fill", "#d1fae5").attr("stroke", "#10b981");

                svg.append("text").attr("x", 95).attr("y", y + 17)
                    .attr("font-size", "13px").attr("font-family", "monospace")
                    .text(line);

                svg.append("text").attr("x", 100 + maxWidth * 10 + 15).attr("y", y + 17)
                    .attr("font-size", "11px").attr("fill", "#666")
                    .text(`(${line.length})`);
            });

            // Done message
            if (phase === 'done') {
                const doneY = 175 + result.length * 30 + 20;
                svg.append("rect").attr("x", width/2 - 100).attr("y", doneY)
                    .attr("width", 200).attr("height", 40).attr("rx", 10)
                    .attr("fill", "#d1fae5").attr("stroke", "#10b981");
                svg.append("text").attr("x", width/2).attr("y", doneY + 26)
                    .attr("text-anchor", "middle").attr("font-weight", "bold")
                    .attr("fill", "#10b981").text("✓ Justification Complete!");
            }
        }

        function justifyLine(line, lineLen, isLast) {
            if (isLast || line.length === 1) {
                return line.join(' ').padEnd(maxWidth, ' ');
            }
            let spaces = maxWidth - lineLen;
            const gaps = line.length - 1;
            const result = [...line];
            for (let i = 0; i < spaces; i++) {
                result[i % gaps] += ' ';
            }
            return result.join(' ');
        }

        function step() {
            if (phase === 'done') return false;

            if (wordIdx >= words.length) {
                // Justify last line
                result.push(justifyLine(currentLine, lineLen, true));
                phase = 'done';
                document.getElementById("status").textContent = "Last line left-justified. Done!";
                draw();
                return false;
            }

            const word = words[wordIdx];
            const wouldBe = lineLen + word.length + (currentLine.length > 0 ? 1 : 0);

            if (wouldBe > maxWidth && currentLine.length > 0) {
                // Justify current line
                const justified = justifyLine(currentLine, lineLen, false);
                result.push(justified);
                document.getElementById("status").textContent =
                    `Line full! Justified to "${justified}"`;
                currentLine = [];
                lineLen = 0;
            } else {
                currentLine.push(word);
                lineLen += word.length;
                document.getElementById("status").textContent =
                    `Added "${word}". Line length: ${lineLen}`;
                wordIdx++;
            }

            draw();
            return true;
        }

        function reset() {
            wordIdx = 0; currentLine = []; lineLen = 0; result = []; phase = 'collecting';
            if (autoTimer) clearInterval(autoTimer);
            autoRunning = false;
            document.getElementById("autoBtn").textContent = "Auto Run";
            document.getElementById("status").textContent = 'Click "Step" to justify text';
            draw();
        }

        function autoRun() {
            if (autoRunning) { clearInterval(autoTimer); autoRunning = false; document.getElementById("autoBtn").textContent = "Auto Run"; }
            else {
                autoRunning = true; document.getElementById("autoBtn").textContent = "Pause";
                autoTimer = setInterval(() => { if (!step()) { clearInterval(autoTimer); autoRunning = false; document.getElementById("autoBtn").textContent = "Auto Run"; } }, 800);
            }
        }

        document.getElementById("stepBtn").addEventListener("click", step);
        document.getElementById("autoBtn").addEventListener("click", autoRun);
        document.getElementById("resetBtn").addEventListener("click", reset);
        reset();
    </script>
</body>
</html>