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EIUATTEND2 - Lesson Attendance |
You are given an attendance list of a class. Suppose that there are some students attend all lessons, and every student joinned at least one lessons.
Your task is to write a program to print out class’s start time, attendance rate.
Input
- The first line contains an integer M – attendance list size (1 £ M £ 105).
- Each line in the next M lines represents 3 integers: class’s start time (in milliseconds format), student ID and class ID followed by a boolean isCheckin (0 - absence or 1 - present) . All integers don’t exceed 1018.
Output
The required sorted list. Each line in the output contains class’s start time, attendance rate (rounded to 2 decimal places, String.format("%.2f",…)). The list should be sorted in descending order of attendance rate and ascending order of class’s start time.
Sample
|
Input |
Output |
|
5 1656894600000 001 0001 1 1656894600000 002 0001 1 1657153800000 001 0001 1 1657499400000 001 0001 1 1657499400000 002 0001 0 |
1656894600000 1.00 1657153800000 0.50 1657499400000 0.50
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| Added by: | Ha Minh Ngoc |
| Date: | 2022-08-29 |
| Time limit: | 1s |
| Source limit: | 50000B |
| Memory limit: | 1536MB |
| Cluster: | Cube (Intel G860) |
| Languages: | All except: GOSU |