Data update

Task/Pancake-numbers/JavaScript/pancake-numbers.js

@@ -0,0 +1,61 @@
+	function flipStack(stack, index) {
+	    const newStack = [...stack];
+	    let start = 0;
+	    let end = index - 1;
+	    while (start < end) {
+	        const temp = newStack[start];
+	        newStack[start] = newStack[end];
+	        newStack[end] = temp;
+	        start++;
+	        end--;
+	    }
+	    return newStack;
+	}
+	function pancake(number) {
+
+	    const initialStack = Array.from({ length: number }, (_, i) => i + 1);
+
+	    const stackFlips = {};
+	    const initialKey = initialStack.join(',');
+	    stackFlips[initialKey] = 0;
+
+	    const queue = [initialStack];
+	    while (queue.length > 0) {
+	        const stack = queue.shift();
+	        const key = stack.join(',');
+
+	        const flips = stackFlips[key] + 1;
+
+	        for (let i = 2; i <= number; ++i) {
+	            const flipped = flipStack(stack, i);
+	            const flippedKey = flipped.join(',');
+
+	            if (stackFlips[flippedKey] === undefined) {
+	                stackFlips[flippedKey] = flips;
+	                queue.push(flipped);
+	            }
+	        }
+	    }
+
+	    let maxFlips = -1;
+	    let worstStackKey = null;
+	    for (const key in stackFlips) {
+	        if (stackFlips[key] > maxFlips) {
+	            maxFlips = stackFlips[key];
+	            worstStackKey = key;
+	        }
+	    }
+
+	    return {
+	        stack: worstStackKey.split(',').map(Number),
+	        flips: maxFlips
+	    };
+	}
+
+	for (let n = 1; n <= 8; ++n) {
+	    const result = pancake(n);
+
+	    const flipsStr = String(result.flips).padStart(2, ' ');
+
+	    console.log(`pancake(${n}) = ${flipsStr}. Example [${result.stack.join(', ')}]`);
+	}