Maximum Subarray in Rust

Published on 09 April 2023 (Updated: 09 April 2023)

Welcome to the Maximum Subarray in Rust page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

use std::env::args;
use std::process::exit;
use std::str::FromStr;
use std::cmp::max;

fn usage() -> ! {
    println!("Usage: Please provide a list of integers in the format: \"1, 2, 3, 4, 5\"");

fn parse_int<T: FromStr>(s: &str) -> Result<T, <T as FromStr>::Err> {

fn parse_int_list<T: FromStr>(s: &str) -> Result<Vec<T>, <T as FromStr>::Err> {
        .collect::<Result<Vec<T>, <T as FromStr>::Err>>()

// Find maximum subarray using Kadane's algorithm.
// Source:
fn maximum_subarray(arr: &Vec<i32>) -> i32 {
    let mut best_sum: i32 = i32::MIN;
    let mut current_sum: i32 = 0;
    for value in arr {
        current_sum = value + max(0, current_sum);
        best_sum = max(current_sum, best_sum);


fn main() {
    let mut args = args().skip(1);

    // Convert 1st command-line argument to list of integers
    let mut arr: Vec<i32> = args
        .and_then(|s| parse_int_list(&s).ok())
        .unwrap_or_else(|| usage());

    // Get maximum subarray and display
    println!("{}", maximum_subarray(&arr));

Maximum Subarray in Rust was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of May 08 2023 19:53:07. The solution was first committed on Apr 09 2023 10:53:37. As a result, documentation below may be outdated.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.