20240625 Finished

This commit is contained in:
jackfiled 2024-06-25 13:12:08 +08:00
parent 869622816b
commit 35693864ac
2 changed files with 65 additions and 1 deletions

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@ -157,4 +157,5 @@ mod p98_validate_binary_search_tree;
mod p200_number_of_islands;
mod p130_surrounded_regions;
mod p399_evaluate_division;
mod p207_course_schedule;
mod p207_course_schedule;
mod p210_course_schedule_ii;

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@ -0,0 +1,63 @@
/**
* [210] Course Schedule II
*/
pub struct Solution {}
// submission codes start here
use std::collections::VecDeque;
impl Solution {
pub fn find_order(num_courses: i32, prerequisites: Vec<Vec<i32>>) -> Vec<i32> {
let num = num_courses as usize;
let mut edges = vec![vec![];num];
let mut in_degs = vec![0;num];
for edge in prerequisites {
let (x, y) = (edge[1] as usize, edge[0] as usize);
edges[x].push(y);
in_degs[y] += 1;
}
let mut queue = VecDeque::new();
for i in 0..num {
if in_degs[i] == 0 {
queue.push_back(i);
}
}
let mut result = vec![];
while !queue.is_empty() {
let node = queue.pop_front().unwrap();
result.push(node);
for &next in &edges[node] {
in_degs[next] -= 1;
if in_degs[next] == 0 {
queue.push_back(next);
}
}
}
if result.len() != num {
vec![]
} else {
result.iter().map(|x| *x as i32).collect()
}
}
}
// submission codes end
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_210() {
}
}