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  1. def fn():
  2.     n = int(input())
  3.     matrix = []
  4.     for i in range(1,n+1):
  5.         line = input().split(" ")
  6.         a, b = int(line[0]), int(line[1])
  7.         matrix.append([a,b])
  8.     print(matrix)
  9.     matrix = sorted(matrix, key = lambda x: x[1])
  10.     curr = matrix[0][1]
  11.     count = 1
  12.     for i in range(1, n):
  13.         if matrix[i][0]>=curr:
  14.            curr = matrix[i][1]
  15.            count+=1
  16.     print(count)
  17. fn()
Success #stdin #stdout 0.05s 9608KB
comments (?)
stdin 
10
5 14
14 17
8 13
13 15
15 17
3 6
4 7
6 9
11 14
10 11
stdout 
[[5, 14], [14, 17], [8, 13], [13, 15], [15, 17], [3, 6], [4, 7], [6, 9], [11, 14], [10, 11]]
5
https://ideone.com/0wTdtG
Spectacles Problem - standard input
language:
Python 3 (python  3.9.5)
created:
267 days ago
visibility:
secret

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