function getPositionAfterRotation(length: number, index: number, rotation: number) {
    if(index - rotation >= 0) {
        return index - rotation;
    }
    return length + index - rotation;
}

function rotLeft(a: number[], d: number): number[] {
    const positionMap:Record<number, number> = {};

    a.forEach((i, idx)=>{
        const newIndex = getPositionAfterRotation(a.length, idx, d);
        positionMap[newIndex] = a[idx];
    });
    return Object.values(positionMap);
}