新员工和导师匹配最大数
输入：
3 4
4
7
9
8
2
5
8
2
输出：
2
data1_str = input()
data1_list = list(map(int, data1_str.split(" ")))
m = data1_list[0]
n = data1_list[1]
new_emp = []
for i in range(m):
new_emp.append(int(input()))
mentor = []
for i in range(n):
mentor.append(int(input()))
new_emp.sort()
mentor.sort()
# print(new_emp)
# print(mentor)
j_flag = 0
result_count = 0
for i in range(len(new_emp)):
if j_flag>(len(mentor)-1):
break
for j in range(j_flag+1, len(mentor)):
if new_emp[i] <= mentor[j]:
j_flag = j
result_count += 1
break
print(result_count)
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