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LeetCode 1353. Maximum Number of Events That Can Be Attended (javascript solution)

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Given an array of events where events[i] = [startDayi, endDayi]. Every event i starts at startDayi and ends at endDayi.

You can attend an event i at any day d where startTimei <= d <= endTimei. Notice that you can only attend one event at any time d.

Return the maximum number of events you can attend.


Time Complexity : O(n^2)
Space Complexity: O(n)

var maxEvents = function(events) {
  let visited = {};
   // Sort events: endTime smaller to bigger, if endTimes are same, prioritize startTime smaller one
  events = events.sort((a,b)=>{
    if(a[1]!=b[1]) return a[1] - b[1];
    return a[0] - b[0];  

  let res=0;
  // Loop through the events and increment the number of days we can attend a unique event
  for(let k=0;k<events.length;k++) {
    let event = events[k];
    let start = event[0];
    let end = event[1];  
    for(let i=start;i<=end;i++) {
      // Only count a day as visited if it has an event we have not visited yet
      if(!visited[i]) {
        visited[i] = true;

  return res;
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