x/masx200_leetcode_test/number-of-students-doing-homework-at-a-given-time/index.ts
12345678910export default function busyStudent( startTime: number[], endTime: number[], queryTime: number,): number { return startTime.map((s, i) => Number(queryTime <= endTime[i] && queryTime >= s) ).reduce((a, v) => a + v, 0);}