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In this approach, we perform the following steps:
Time Complexity: O((n + m) log n) where n = number of items and m = number of queries.
Space Complexity: O(n) for storing the processed items data.
1function maxBeautyForQueries(items, queries) {
2 items.sort((a, b) => a[0] - b[0]);
3 const maxBeauty = new Array(items.length);
4 let maxB = 0;
5
6 for (let i = 0; i < items.length; i++) {
7 maxB = Math.max(maxB, items[i][1]);
8 maxBeauty[i] = maxB;
9 }
10
11 function findBest(query) {
12 let left = 0, right = items.length - 1;
13 while (left <= right) {
14 const mid = Math.floor((left + right) / 2);
15 if (items[mid][0] <= query) {
16 left = mid + 1;
17 } else {
18 right = mid - 1;
19 }
20 }
21 return right >= 0 ? maxBeauty[right] : 0;
22 }
23
24 return queries.map(findBest);
25}
26
27// Example usage:
28const items = [[1,2],[3,2],[2,4],[5,6],[3,5]];
29const queries = [1,2,3,4,5,6];
30console.log(maxBeautyForQueries(items, queries));This JavaScript implementation sorts items and maintains a cumulative maximum beauty list. Each query uses a binary search to quickly locate the applicable maximum beauty at the time of querying.
Coordinate compression can be used to reduce problem complexity when dealing with large range values like prices. In this approach:
Time Complexity: O((n + m) log(n + m)) due to sorting during compression.
Space Complexity: O(n + m) for storing all price points and decision arrays.
JavaScript code makes full use of Sets and Maps for efficient price compression, mapping these prices to maintained beauty maximums for fast index-based query responses. This enables quick filter and calculate actions post-compression.