Untitled

function func(s) {
    const map = new Map();
    const arr = new Array(s.length).fill(0);

    for (let i = 0; i < s.length; i++) {
        if (s[i] === '$') {
            arr[i] = -1;

            // Get the smallest key from the map
            const firstKey = [...map.keys()].sort()[0];
            const queue = map.get(firstKey);

            const index = queue.shift(); // Remove the first (smallest) index
            arr[index] = -1;

            if (queue.length === 0) {
                map.delete(firstKey); // Remove the key if the queue is empty
            }
        } else {
            let queue = map.get(s[i]);
            if (!queue) {
                queue = [];
            }

            // Insert the index into the queue in descending order
            queue.push(i);
            queue.sort((a, b) => b - a); // Sort in descending order
            map.set(s[i], queue);
        }
    }

    let result = '';
    for (let i = 0; i < s.length; i++) {
        if (arr[i] !== -1) {
            result += s[i];
        }
    }

    return result;
}