20250108 finished.

src/problem/mod.rs

@@ -418,3 +418,5 @@ mod p2241_design_an_atm_machine;
 mod p2274_maximum_consecutive_floors_without_special_floors;
 
 mod p3019_number_of_changing_keys;
+
+mod p2264_largest_3_same_digit_number_in_string;

src/problem/p2264_largest_3_same_digit_number_in_string.rs

@@ -0,0 +1,45 @@
+/**
+ * [2264] Largest 3-Same-Digit Number in String
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+const NUMBERS: [&str; 10] = [
+    "999", "888", "777", "666", "555", "444", "333", "222", "111", "000",
+];
+
+impl Solution {
+    pub fn largest_good_integer(num: String) -> String {
+        for n in NUMBERS {
+            if num.contains(n) {
+                return n.to_owned();
+            }
+        }
+
+        "".to_owned()
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2264() {
+        assert_eq!(
+            "777".to_owned(),
+            Solution::largest_good_integer("6777133339".to_owned())
+        );
+        assert_eq!(
+            "000".to_owned(),
+            Solution::largest_good_integer("2300019".to_owned())
+        );
+        assert_eq!(
+            "".to_owned(),
+            Solution::largest_good_integer("42352338".to_owned())
+        );
+    }
+}