CF152A.Marks
普及/提高-
通过率:0%
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题目描述
Vasya, or Mr. Vasily Petrov is a dean of a department in a local university. After the winter exams he got his hands on a group's gradebook.
Overall the group has n students. They received marks for m subjects. Each student got a mark from 1 to 9 (inclusive) for each subject.
Let's consider a student the best at some subject, if there is no student who got a higher mark for this subject. Let's consider a student successful, if there exists a subject he is the best at.
Your task is to find the number of successful students in the group.
输入格式
The first input line contains two integers n and m ( 1<=n,m<=100 ) — the number of students and the number of subjects, correspondingly. Next n lines each containing m characters describe the gradebook. Each character in the gradebook is a number from 1 to 9 . Note that the marks in a rows are not sepatated by spaces.
输出格式
Print the single number — the number of successful students in the given group.
输入输出样例
输入#1
3 3 223 232 112
输出#1
2
输入#2
3 5 91728 11828 11111
输出#2
3
说明/提示
In the first sample test the student number 1 is the best at subjects 1 and 3 , student 2 is the best at subjects 1 and 2 , but student 3 isn't the best at any subject.
In the second sample test each student is the best at at least one subject.