1450-number-of-students-doing-homework-at-a-given-time

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js

/**
 * @param {number[]} startTime
 * @param {number[]} endTime
 * @param {number} queryTime
 * @return {number}
 */
var busyStudent = function(startTime, endTime, queryTime) {
    return startTime.reduce(
        (sum,el,I)=> sum + ((el<=queryTime && endTime[I]>=queryTime)?1:0),
        0
    );
};