题解 | 小红的优惠券
小红的优惠券
https://www.nowcoder.com/practice/e991a011f96444f3a6ad57943d39f4ad
import sys
n,m =map(int,input().split())
p = []
for i in range(m):
a , b = [int(i) for i in input().split()]
if n >= a:
p.append(n-b)
else:
pass
if p == []:
p.append(n)
print(min(p))
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