function tasksPlanner(arr) {

    let tasks = arr.shift().split(' ').map(Number);

    for (let iterator of arr) {
        let [command, index, time] = iterator.split(' ');
        time = Number(time);
        index = Number(index);

        if (command === 'End') {
            break;
        }
        if (command === 'Complete') {
            complete(+index)
        }
        if (command === 'Change') {
            change(+index, time);
        }
        if(command === 'Drop'){
            drop(+index);
        }






    }

    function complete(index) {
        arr.find(function (index) {
            arr[i] = 0;
        }

    }
     function change(index, time){
         if(index >= 0 && index < tasks.length){
             tasks[index] = time;
         }}

        function drop(index){
            if(index >= 0 && index < tasks.length){
                tasks[index] = -1;
                arr.filter(index => index >= 0);
            }
        }

        console.log(arr);

}
    tasksPlanner(['1 -1 2 3 4 5 ', 'Complete 4', 'Change 0 4', 'Drop 3', 'Count Dropped', 'End']);