题解 | 小红的优惠券
小红的优惠券
https://www.nowcoder.com/practice/e991a011f96444f3a6ad57943d39f4ad
n, m = map(int,input().split())
dic = {}
for i in range(m):
k,v = map(int,input().split())
dic[k] = v
new_dic = sorted(dic.items(),key = lambda x:(-x[1],x[0]))
out = n
for i in range(m):
if n>=new_dic[i][0]:
out = n - new_dic[i][1]
break
print(out)
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