💻
Algorithm
  • README
  • Array
    • At Most To Equal
    • Count Inversions In An Array
    • Interleaving Placement
    • Kadane
    • Left To Right State Transition
    • Permutation
    • Quick Select
    • Sliding Window
    • Two Pointers
  • Binary Tree
    • Avl Tree
    • Binary Search Tree
    • Serialization And Deserialization
    • Traversal
  • Company
    • Facebook
  • Cpp
    • Array
    • Memset 3 F
    • Overflow
  • Data Structure
    • Binary Indexed Tree
    • Segment Tree And Binary Index Tree
    • Segment Tree
    • Stack
    • Trie
    • Union Find
  • Dynamic Programming
    • Knapsack
      • 0 1 Knapsack
      • Bounded Knapsack
      • Unbounded Knapsack
    • Bitmask Dp
    • Dp On Subsets
    • Dp On Tree
    • Dp With Sorting
    • Selective State Dp
    • Travelling Salesperson
  • Graph
    • Minimum Spanning Tree
      • Kruskal
      • Prim
    • Shortest Path
      • Bellman Ford
      • Dijkstra
      • Floyd Warshall
      • Johnson
      • Shortest Path Faster Algorithm
    • Bi Directional Breadth First Search
    • Bipartite
    • Breadth First Search
    • Component Coloring
    • Component Count
    • Depth First Search
    • Eulerian Path
    • Maximum Bipartite Matching
    • Tarjan
    • Topological Sort
    • Tree Diameter
    • Tree Ring Order Traversal
  • Greedy
    • Greedy Scheduling
    • Regret Greedy
  • Math
    • Catalan Number
    • Combinatorics
    • Factorial
    • Factorization
    • Fast Pow
    • Gcd
    • Geometry
    • Get Digits
    • Lcm
    • Median Minimizes Sum Of Absolute Deviations
    • Mode
    • Modular Multiplicative Inverse
    • Palindrome
    • Prime Number
    • Round Up
    • Sieve Of Eratosthenes
    • Stars And Bars
    • Sum Of Sequence
  • Miscellaneous
    • Bin Packing
    • Floyds Tortoise And Hare
    • Hungarian
    • Palindrome
  • Sort
    • Bubble Sort
    • Cycle Sort
    • Heap Sort
    • Merge Sort
    • Quick Sort
    • Sorting
  • Stl
    • Cpp Stl
    • Istringstream
    • Lower Bound Upper Bound
    • Priority Queue
  • String
    • Kmp
    • Manacher
    • Rabin Karp
    • String Processing
    • Z
  • Backtracking
  • Binary Answer
  • Binary Lifting
  • Binary Search
  • Bit Manipulation
  • Date
  • Difference Array
  • Discretization
  • Divide And Conquer
  • Gray Code
  • Great Problems For Practice
  • Interval Scheduling Maximization
  • Io Optimization
  • K Subset Partitioning
  • Line Sweep
  • Longest Common Subsequence
  • Longest Increasing Subsequence
  • Meet In The Middle
  • Minmax
  • Mono Deque
  • Monotonic Stack
  • Offline Query
  • P And Np
  • Prefix State Map
  • Prefix Sum
  • Random
  • Reservoir Sampling
  • Reverse Polish Notation
  • Sqrt Decomposition
Powered by GitBook
On this page
  • Problems
  • Discuss

Was this helpful?

Offline Query

PreviousMonotonic StackNextP And Np

Last updated 3 years ago

Was this helpful?

A common trick for solving problems related to a series of queries.

When we know all the queries upfront, we can sort the query and the original data in some order so that we can scan the query and the original data simultaneously (which takes O(N + Q) time), instead of scanning all original data for each query (which takes O(N * Q) time).

The name "offline" signifies the fact that we know all the queries upfront/offline. If the queries keep streaming in (i.e. online), we can't reorder the queries to get a better time complexity.

Problems

Discuss

https://leetcode.com/problems/most-beautiful-item-for-each-query/discuss/1576065/C%2B%2B-Offline-Query

1707. Maximum XOR With an Element From Array (Hard)
1847. Closest Room (Hard)
2070. Most Beautiful Item for Each Query (Medium)