Leetcode 2563 Count the Number of Fair Pairs (Java) - Leetcode Weekly Contest 332

Leetcode 2563 Count the Number of Fair Pairs (Java)

Leetcode Weekly Contest 332 Feb 11, 2023
Leetcode Contest 332 Feb 11, 2023

0:00 Problem Introduction
0:44 Intuition and Approach Overview
5:46 Coding: Top Level Algorithm
6:44 Coding: Count Pairs Algorithm
8:55 Run/Debug Solution

Time: O(nlogn)
Space: O(1)

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[rk-ljci]

very intelligent solution, how do I come up with this kind of solution on my own?? When solving this problem I understood similar pattern can be used but could'nt figure out the exact trick.

[imranimmu]

clean code. Thanks for the explanation

[tanson]

Writing findLessThanEqualTo method as below can be more easy to understand.. Thanks for sharing your thought process.
private long findLessThanEqualTo(int[] nums, int target) {
int i=0, j= nums.length-1;
long pairCount = 0;
while(i<j){
if(nums[i]+nums[j]<=target){
pairCount+=j-i;
i++;
}else{
j--;
}
}
return pairCount;
}