1893. 检查是否区域内所有整数都被覆盖

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class Solution {
    public boolean isCovered(int[][] ranges, int left, int right) {
        for(int[] arr : ranges){
            int l = arr[0];
            int r = arr[1];
            if(left >= l && left<= r){
                if(r >= right){
                    return true;
                }
                if(isCovered(ranges, r+1, right)){
                    return true;
                }
            }
        }
        return false;
    }
}