题解 | 植树节
植树节
https://www.nowcoder.com/practice/bf18f4e68f614b35a7a6c56c743d82fc
n = int(input())
dic = {}
c = 0
for i in range(n):
a, d = map(int,input().split())
dic[a] = dic.get(a,0) + 1
dic[d+1] = dic.get(d+1,0) - 1
if d > c:
c = d
s = 0
m = 0
for i in sorted(dic.keys()):
if i > c:
break
s += dic[i]
if s > m:
m = s
print(m)
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