题目链接

LeetCode 1512. 好数对的数目

解题代码

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/**
 * @param {number[]} nums
 * @return {number}
 */
var numIdenticalPairs = function(nums) {
    let end = nums.length-1;
    let start = 0;
    let total = 0;
    
    while(start != nums.length-1) {
        if(nums[start] === nums[end]) {
            total++;
        }
        end--;
        
        if(end == start) {
            end = nums.length-1;
            start++;
        }
    }
    
    return total;
};