Data update

Task/Colorful-numbers/JavaScript/colorful-numbers.js

@@ -0,0 +1,85 @@
+function chunk_array(arr, n) {
+    const chunks = [];
+
+    for (let i = 0; i < arr.length; i++) {
+        const sliced = arr.slice(i, i + n);
+        if (sliced.length == n) {
+            chunks.push(sliced);
+        }
+    }
+
+    return chunks;
+}
+
+function isColorful(num) {
+    const numArr = num.toString().split('').map(item => parseInt(item));
+
+    if (numArr.length == 1) {
+        return true;
+    }
+
+    const count = {};
+
+    for (const num of numArr) {
+        const c = (count[num] || 0) + 1;
+
+        if (c == 2) {
+            return false;
+        }
+
+        count[num] = c;
+    }
+
+    const prods = [];
+
+    for(let i = 2; i < numArr.length+1; i++) {
+        const chunked = chunk_array(numArr, i);
+        for (const chunk of chunked) {
+            const prod = chunk.reduce((prev, val) => prev * val, 1);
+
+            if (numArr.includes(prod) || prods.includes(prod)) {
+                return false;
+            }
+            prods.push(prod);
+        }
+    }
+
+    return true;
+}
+
+
+const colorful = [];
+
+for(let i = 0; i < 100; i++) {
+    if (isColorful(i)) {
+        colorful.push(i);
+    }
+}
+
+console.log(`Amount of colorful numbers lesser than 100 is ${colorful.length}`);
+console.log(colorful);
+
+let isStart = true;
+let maxColorful = 0;
+let totalCount = 0;
+
+for (let i = 10; i < 1000000000; i *= 10) {
+    const colorful = [];
+
+    for(let j = isStart ? 0 : (i / 10); j < i; j++) {
+        if (isColorful(j)) {
+            colorful.push(j);
+            maxColorful = Math.max(maxColorful, j);
+        }
+    }
+
+    totalCount += colorful.length;
+    console.log(`The count of colorful numbers between ${isStart ? 0 : (i / 10)} and ${i-1} is ${colorful.length}`);
+
+    if (isStart) {
+        isStart = false;
+    }
+}
+
+console.log(`The largest possible colorful number is ${maxColorful}.`);
+console.log(`The total number of colorful numbers is ${totalCount}.`);