Add problem 1869: Substrings of Size Three with Distinct Characters

src/lib.rs

@@ -1429,6 +1429,7 @@ pub mod problem_1854_maximum_population_year;
 pub mod problem_1855_maximum_distance_between_a_pair_of_values;
 pub mod problem_1859_sorting_the_sentence;
 pub mod problem_1860_incremental_memory_leak;
+pub mod problem_1869_longer_contiguous_segments_of_ones_than_zeros;
 
 #[cfg(test)]
 mod test_utilities;

src/problem_1869_longer_contiguous_segments_of_ones_than_zeros/iterative.rs

@@ -0,0 +1,64 @@
+pub struct Solution;
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl Solution {
+    pub fn check_zero_ones(s: String) -> bool {
+        let mut iter = s.bytes();
+        let mut longest_zeros = 0_u8;
+        let mut longest_ones = 0_u8;
+        let mut length = 0_u8;
+
+        'outer: loop {
+            if let Some(c) = iter.next() {
+                if c == b'0' {
+                    length += 1;
+                } else {
+                    longest_zeros = longest_zeros.max(length);
+
+                    length = 1;
+
+                    loop {
+                        if let Some(c) = iter.next() {
+                            if c == b'0' {
+                                longest_ones = longest_ones.max(length);
+
+                                length = 1;
+
+                                break;
+                            }
+
+                            length += 1;
+                        } else {
+                            longest_ones = longest_ones.max(length);
+
+                            break 'outer;
+                        }
+                    }
+                }
+            } else {
+                longest_zeros = longest_zeros.max(length);
+
+                break;
+            }
+        }
+
+        longest_ones > longest_zeros
+    }
+}
+
+// ------------------------------------------------------ snip ------------------------------------------------------ //
+
+impl super::Solution for Solution {
+    fn check_zero_ones(s: String) -> bool {
+        Self::check_zero_ones(s)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_solution() {
+        super::super::tests::run::<super::Solution>();
+    }
+}

src/problem_1869_longer_contiguous_segments_of_ones_than_zeros/mod.rs

@@ -0,0 +1,18 @@
+pub mod iterative;
+
+pub trait Solution {
+    fn check_zero_ones(s: String) -> bool;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::Solution;
+
+    pub fn run<S: Solution>() {
+        let test_cases = [("1101", true), ("111000", false), ("110100010", false)];
+
+        for (s, expected) in test_cases {
+            assert_eq!(S::check_zero_ones(s.to_string()), expected);
+        }
+    }
+}