Ruudukko

use std::io;
use std::thread;
use std::cmp::min;
 
fn recurse(y: usize, x: usize, array: &Vec<Vec<i32>>) -> i64 {
    let mut paths = 1;
    for (index, i) in array[y].iter().enumerate() {
        if i < &array[y][x] {
            paths += recurse(y, index, array);
        }
    }
    for (index, i) in array.iter().enumerate() {
        if i[x] < array[y][x] {
            paths += recurse(index, x, array);
        }
    }
    return paths;
}
 
fn split(a: usize, n: usize) -> Vec<(usize, usize)> {
    let k = a / n;
    let m = a % n;
    let mut v = Vec::new();
    for i in 0..n {
        let start = i * k + min(i, m);
        let end = (i + 1) * k + min(i + 1, m);
        v.push((start, end));
    }
    v
}
 
 
fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    let input: i32 = input.trim().parse().unwrap();
    let mut array = Vec::new();
    for _ in 0..input {
        let mut input = String::new();
        io::stdin().read_line(&mut input).unwrap();
        let input: Vec<i32> = input.split_whitespace().map(|x| x.parse().unwrap()).collect();
        array.push(input);
    }
 
    let mut handles = Vec::new();
 
    let mut paths: i64 = 0;
    let split = split(input as usize, 4);
    for y in 0..4 {
        let array = array.clone();
        let split = split.clone();
        let handle = thread::spawn(move || {
            let mut total = 0;
            for i in split[y].0..split[y].1 {
                let mut paths = 0;
                for j in 0..input {
                    paths += recurse(i as usize, j as usize, &array);
                }
                total += paths;
            }
            total
        });
        handles.push(handle);
    }
    for handle in handles {
        paths += handle.join().unwrap();
    }
    println!("{}", paths);
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 6

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 8

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 9

Group: 3

Verdict: TIME LIMIT EXCEEDED