Create index.ts

Author: masx200

number-of-students-doing-homework-at-a-given-time/index.ts

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+export default function busyStudent(startTime: number[], endTime: number[], queryTime: number): number {
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+
+
+return startTime.map((s,i)=>Number(queryTime<=endTime[i]&&queryTime>=s)).reduce((a,v)=>a+v,0)
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+
+
+
+}