You are given an array tasks where tasks[i] = [actuali, minimumi]: actuali is the actual amount of energy you spend to finish the ith task. minimumi is the minimum amount of energy you require to begin the ith task. For example, if the task is [10,

minimumEffort.js

/**
 * @param {number[][]} tasks
 * @return {number}
 */
var minimumEffort = function(tasks) {
    // Sort by (minimum - actual) descending
    tasks.sort((a, b) => (b[1] - b[0]) - (a[1] - a[0]));

    let totalActual = 0; // sum of actual costs of tasks done so far
    let answer = 0;      // minimal initial energy required

    for (let [actual, minimum] of tasks) {
        // For this task, we need: initial >= minimum + totalActualBefore
        answer = Math.max(answer, minimum + totalActual);
        totalActual += actual;
    }

    return answer;
};