Adding file::read_to_matrix, parse::string_to_numbers.

src/file.rs

@@ -1,5 +1,7 @@
 use std::fs;
 
+use crate::parse::string_to_numbers;
+
 pub fn read_to_lines(_filename: &str) -> Result<Vec<String>, String> {
     let _contents = fs::read_to_string(_filename);
     if let Err(v) = _contents {
@@ -23,3 +25,18 @@ pub fn read_to_string(_filename: &str) -> Result<String, String> {
         Err(v) => Err(v)
     }
 }
+
+pub fn read_to_matrix(_filename: &str) -> Result<Vec<Vec<i128>>, String> {
+    let _lines = read_to_lines(_filename);
+
+    if let Err(v) = _lines {
+        return Err(v);
+    }
+
+    Ok(_lines
+        .unwrap()
+        .iter()
+        .map(|x| string_to_numbers(x.to_string()))
+        .collect()
+    )
+}

src/parse.rs

@@ -2,7 +2,20 @@ pub fn string_to_usize_vec(input: String) -> Vec<usize> {
     input.chars().map(|x| x.to_digit(10).unwrap() as usize).collect()
 }
 
+pub fn string_to_numbers(input: String) -> Vec<i128> {
+    input
+        .split_whitespace()
+        .map(|x| x.parse::<i128>().unwrap())
+        .collect()
+}
+
 #[test]
 fn test_string_to_usize_vec() {
     assert_eq!(vec![1, 2, 3, 4], string_to_usize_vec(String::from("1234")));
 }
+
+#[test]
+fn test_string_to_numbers() {
+    assert_eq!(vec![1, 2, -3, -4], string_to_numbers(String::from("1 2 -3 -4")));
+}
+