LeetCode 539. 最小时间差

539. 最小时间差

Solution

思路:

将所有时间字符串排序后 最小时间只可能是 前后相邻时间 和 首位时间。1440可以剪枝处理,因为24*60。

class Solution {
    public int findMinDifference(List<String> timePoints) {
        if (timePoints.size() > 1440) {
            return 0;
        }
        Collections.sort(timePoints);
        int ans = Integer.MAX_VALUE;
        int minTime = getMinute(timePoints.get(0));
        int preTime = minTime;
        for (int i = 1; i < timePoints.size(); i++) {
            int curTime = getMinute(timePoints.get(i));
            ans = Math.min(ans, curTime - preTime);
            preTime = curTime;
        }
        ans = Math.min(ans, minTime + 1440 - preTime);
        return ans;
    }
    public int getMinute(String time) {
        return ((time.charAt(0) - '0') * 10 + time.charAt(1) - '0') * 60 + (time.charAt(3) - '0') * 10 + time.charAt(4) - '0';
    }
}
posted @ 2022-01-19 16:34  Frontierone  阅读(22)  评论(0编辑  收藏  举报