LeetCode 1512. Number of Good Pairs

問題：判斷是否為Good Pairs，Good Pairs成立條件：A pair (i, j) is called good if nums[i] == nums[j] and i < j. 

解法：兩個for搭配上面成立條件輸出計數即可 JavaScript

/**
 * @param {number[]} nums
 * @return {number}
 */
var numIdenticalPairs = function (nums) {
    let count = 0;
    for (let i = 0; i < nums.length; i++) {
        for (let j = 0; j < nums.length; j++) {
            if (nums[i] == nums[j] && i < j) {
                count++;
            }
        }
    }

    return count;
};