题解 | 校门外的树
校门外的树
https://www.nowcoder.com/practice/0e8cfc82936048769af45967f3c4ef7e
from re import T
import sys
L,M = map(int,input().split())
#种树区域设为1
TreeArea = [1]*(L+1)
for _ in range(M):
#施工区域树设为0
startArea,endArea = map(int,input().split())
for i in range(startArea,endArea+1):
TreeArea[i]=0
print(sum(TreeArea))
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