sorts: Replace flatten()

math/src/num_of_digits.rs

@@ -25,7 +25,7 @@ pub const fn num_digits(num: i64) -> usize {
 
 /// Find the number of digits in a number.
 ///
-/// abs() is used as logarithm for negative numbers is not defined.
+/// `abs()` is used as logarithm for negative numbers is not defined.
 #[must_use]
 pub fn num_digits_fast(num: i64) -> usize {
     if num == 0 {
@@ -38,7 +38,7 @@ pub fn num_digits_fast(num: i64) -> usize {
 
 /// Find the number of digits in a number.
 ///
-/// abs() is used for negative numbers
+/// `abs()` is used for negative numbers
 #[must_use]
 pub fn num_digits_faster(num: i64) -> usize {
     num.abs().to_string().len()

sorts/src/util.rs

@@ -52,8 +52,8 @@ where
 pub fn read_ints() -> Vec<i32> {
     let mut v = vec![];
     let buffer = BufReader::new(io::stdin());
-    let input_iter = buffer.lines();
-    for line in input_iter.flatten() {
+    let mut input_iter = buffer.lines();
+    while let Some(Ok(line)) = input_iter.next() {
         for word in line.split_whitespace() {
             let value = word.parse::<i32>().expect("Invalid integer");
             v.push(value);
@@ -65,11 +65,11 @@ pub fn read_ints() -> Vec<i32> {
 #[must_use]
 pub fn read_strings() -> Vec<String> {
     let buffer = BufReader::new(io::stdin());
-    let input_iter = buffer.lines();
+    let mut input_iter = buffer.lines();
     let mut v = vec![];
-    for line in input_iter.flatten() {
+    while let Some(Ok(line)) = input_iter.next() {
         for word in line.split_whitespace() {
-            v.push(word.to_string());
+            v.push(word.to_owned());
         }
     }
     v