题目：

题解：

class Solution {public int eraseOverlapIntervals(int[][] intervals) {if (intervals.length == 0) {return 0;}Arrays.sort(intervals, new Comparator<int[]>() {public int compare(int[] interval1, int[] interval2) {return interval1[1] - interval2[1];}});int n = intervals.length;int right = intervals[0][1];int ans = 1;for (int i = 1; i < n; ++i) {if (intervals[i][0] >= right) {++ans;right = intervals[i][1];}}return n - ans;}
}