题解 | 校门外的树
校门外的树
https://www.nowcoder.com/practice/0e8cfc82936048769af45967f3c4ef7e?tpId=383&tags=&title=&difficulty=0&judgeStatus=0&rp=0&sourceUrl=%2Fexam%2Foj%3FquestionJobId%3D10%26subTabName%3Donline_coding_page
import sys
L, M = map(int, input().split())
list1 = [int(1) for x in range(L + 1)]
for i in range(0, M):
m, n = map(int, input().split())
list1[m : n + 1] = [int(0) for x in range(m, n + 1)]
print(list1.count(1))
