function mergeLogs(left, right){
    const ids = new Set([
        ...left.map(x => x.id),
        ...right.map(x => x.id)
    ]);
    return [...ids].map(id => mergeIdLogs(
        left.filter(x => x.id == id),
        right.filter(x => x.id ==id)
    )).reduce((a,b) => ({
        left: [...a.left, ...b.left],
        right: [...a.right, ...b.right]
    }), {left: [], right: []});
}
function mergeIdLogs(left,right){
    const isWin = log => log.some(x => ['create','delete'].includes(x.type));
    const getMaxUpdate = log => Math.max(...log.map(x => +x.updatedAt));
    if (isWin(left))
        return {left: [], right: left};
    if (isWin(right))
        return {left: right, right: []};
    if (getMaxUpdate(left) > getMaxUpdate(right))
        return {left: [], right: left};
    else
        return {left: right, right: []};
}