# Successful Pairs of Spells and Potions

Category

Binary Search

Checkbox

Checkbox

Difficulty

Medium

Index

54

Key Ideas

The key idea to solve this problem is to use the two-pointer technique to find pairs of spells and potions that have a specific sum.

Problem Number

2300

Problem Summary

The problem "Successful Pairs of Spells and Potions" is categorized as a medium-level binary search problem in the LeetCode-75 curated list. It involves finding the number of successful pairs of spells and potions given two arrays. A key pitfall in this problem is handling duplicate elements correctly to avoid counting them as separate pairs.

Solution Summary

The best solution to solve this problem would be to use the Two Pointers technique. First, sort the given array in ascending order. Then, initialize two pointers, one at the beginning of the array and the other at the end. Calculate the sum of the values at the two pointers. If the sum is equal to the target value, return the pair of elements. If the sum is less than the target value, move the left pointer to the right. If the sum is greater than the target value, move the right pointer to the left. Repeat this process until the pointers meet or the target value is found. This approach has a time complexity of O(n), where n is the size of the array.

Tags

Array

Two Pointers

Binary Search