README.md

1854. Maximum Population Year

You are given a 2D integer array logs where each logs[i] = [birthi, deathi] indicates the birth and death years of the ith person.

The population of some year x is the number of people alive during that year. The ith person is counted in year x's population if x is in the inclusive range [birthi, deathi - 1]. Note that the person is not counted in the year that they die.

Return the earliest year with the maximum population.

Example 1:

Input: logs = [[1993,1999],[2000,2010]]
Output: 1993
Explanation: The maximum population is 1, and 1993 is the earliest year with this population.

Example 2:

Input: logs = [[1950,1961],[1960,1971],[1970,1981]]
Output: 1960
Explanation: The maximum population is 2, and it had happened in years 1960 and 1970.
The earlier year between them is 1960.

Constraints:

• 1 <= logs.length <= 100
• 1950 <= birthi < deathi <= 2050

Solutions (Rust)

1. Solution

impl Solution {
    pub fn maximum_population(logs: Vec<Vec<i32>>) -> i32 {
        let mut max = 0;
        let mut ret = 1950;

        for year in 1950..=2050 {
            let population = logs
                .iter()
                .filter(|&log| (log[0]..log[1]).contains(&year))
                .count();

            if population > max {
                max = population;
                ret = year;
            }
        }

        ret
    }
}