20241008 finished.

src/problem/mod.rs

@@ -256,4 +256,5 @@ mod p1870_minimum_speed_to_arrive_on_time;
 mod p1928_minimum_cost_to_reach_destination_in_time;
 mod p1227_airplane_seat_assignment_probability;
 mod p2187_minimum_time_to_complete_trips;
-mod p871_minimum_number_of_refueling_stops;
+mod p871_minimum_number_of_refueling_stops;
+mod p1436_destination_city;

src/problem/p1436_destination_city.rs

@@ -0,0 +1,36 @@
+/**
+ * [1436] Destination City
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn dest_city(paths: Vec<Vec<String>>) -> String {
+        use std::collections::HashMap;
+
+        let mut out_map = HashMap::new();
+
+        for path in paths.iter() {
+            let start_entry = out_map.entry(&path[0]).or_insert(0);
+            *start_entry += 1;
+
+            out_map.entry(&path[1]).or_insert(0);
+        }
+
+        out_map.iter().filter(|(_, &v)| v == 0).map(|(k, _)| k.to_string()).next().unwrap()
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1436() {
+        assert_eq!("A".to_owned(), Solution::dest_city(vec![vec_string!("B", "C"), vec_string!("D", "B"), vec_string!("C", "A")]));
+    }
+}