LeetCode 1512. 好數(shù)對的數(shù)目
https://leetcode-cn.com/problems/number-of-good-pairs/
Java
public int numIdenticalPairs(int[] nums) {
if (nums.length < 0) {
return 0;
}
int[] counts = new int[101];
int count = 0;
for (int num : nums) {
count += counts[num];
counts[num]++;
}
return count;
}

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