Pairs of Songs With Total Durations Divisible by 60
给一个数组， 找到其中有多少对数的和整除60。这里上来先取模，然后就是2sum pair
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class Solution { public int numPairsDivisibleBy60(int[] time) { for(int i = 0 ; i < time.length; i++) { time[i] %= 60; } int count = 0; Map<Integer, Integer> map = new HashMap<Integer, Integer>(); for(int i = 0; i < time.length; i++) { int key = (60 - time[i]) % 60; count += map.getOrDefault(key, 0); map.put(time[i], map.getOrDefault(time[i], 0)+1); } return count; } } |