Binge watching

#![allow(unused)]

use std::io;

fn take_int() -> usize {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    return input.trim().parse::<usize>().unwrap();
}

fn take_tuple() -> (i128, i128) {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let (a, b) = input.trim().split_once(' ').unwrap();
    (a.parse().unwrap(), b.parse().unwrap())
}

fn main() {
    let mut num_movies: usize = take_int();
    let mut times: Vec<(i128, i128)> = Vec::with_capacity(num_movies);
    let mut count: usize = 0;
    let mut last_finish = 0;

    for i in 0..num_movies {
        times.push(take_tuple());
    }

    times.sort_unstable_by_key(|k| k.1);

    for i in 0..num_movies {
        if times[i].0 >= last_finish {
            last_finish = times[i].0;
            count += 1;
        }
    }

    println!("{}", count);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED