update Readme to Day07

Day07/js/solution.js

@@ -0,0 +1,97 @@
+const fs = require('fs');
+
+function readHands(filePath) {
+    try {
+        const data = fs.readFileSync(filePath, 'utf-8');
+        console.log(`Reading hands from ${filePath}...`);
+        return data.trim().split('\n').map(line => line.split(' '));
+    } catch (err) {
+        console.error(`Error reading file ${filePath}: ${err}`);
+        throw err;
+    }
+}
+
+function replaceFaceCards(hand) {
+    return hand.replace(/T/g, 'a')
+               .replace(/J/g, '1')
+               .replace(/Q/g, 'c')
+               .replace(/K/g, 'd')
+               .replace(/A/g, 'e');
+}
+
+function calculateStrength(hand) {
+    hand = replaceFaceCards(hand);
+    const counts = hand.split('').reduce((acc, card) => {
+        acc[card] = (acc[card] || 0) + 1;
+        return acc;
+    }, {});
+
+    if ('1' in counts) {
+        let maxCount = Math.max(...Object.values(counts));
+        let maxCard = Object.keys(counts).find(card => counts[card] === maxCount && card !== '1');
+        
+        if (maxCard) {
+            counts[maxCard] += counts['1'];
+            delete counts['1'];
+        }
+    }
+
+    const sortedCounts = Object.values(counts).sort((a, b) => b - a);
+    
+    console.log(`Hand: ${hand}, Counts: ${sortedCounts}`);
+
+    if (sortedCounts.toString() === '5') return 10;
+    if (sortedCounts.toString() === '1,4') return 9;
+    if (sortedCounts.toString() === '2,3') return 8;
+    if (sortedCounts.toString() === '1,1,3') return 7;
+    if (sortedCounts.toString() === '1,2,2') return 6;
+    if (sortedCounts.toString() === '1,1,1,2') return 5;
+    if (sortedCounts.toString() === '1,1,1,1,1') return 4;
+    
+    throw new Error(`Invalid hand: ${hand}, Counts: ${sortedCounts}`);
+}
+
+function handKey(hand) {
+    return calculateStrength(hand[0]);
+}
+
+function calculateTotalWinnings(filePath) {
+    try {
+        const hands = readHands(filePath);
+        console.log("Sorting hands based on strength...");
+        hands.sort((a, b) => handKey(b) - handKey(a));
+        
+        console.log("Calculating total winnings...");
+        return hands.reduce((acc, [hand, bid], index) => {
+            const winnings = (index + 1) * parseInt(bid, 10);
+            console.log(`Hand: ${hand}, Rank: ${index + 1}, Bid: ${bid}, Winnings: ${winnings}`);
+            return acc + winnings;
+        }, 0);
+    } catch (err) {
+        console.error(`Error calculating winnings: ${err}`);
+        throw err;
+    }
+}
+
+function runTest(filePath, expected) {
+    console.log(`Running test with ${filePath}...`);
+    try {
+        const totalWinnings = calculateTotalWinnings(filePath);
+        console.assert(totalWinnings === expected, `Test failed, expected ${expected} but got ${totalWinnings}`);
+        console.log(`Test passed: ${totalWinnings}`);
+    } catch (err) {
+        console.error(`Test failed: ${err}`);
+    }
+}
+
+function main() {
+    try {
+        runTest("../test.txt", 5905);
+        const result = calculateTotalWinnings("../input.txt");
+        console.log(`Total result from input.txt: ${result}`);
+    } catch (err) {
+        console.error(`An error occurred: ${err}`);
+    }
+}
+
+main();