20240326 Finished

src/problem/mod.rs

@@ -84,4 +84,5 @@ mod p2671_frequency_tracker;
 mod p2617_minimum_number_of_visited_cells_in_a_grid;
 mod p2549_count_distinct_numbers_on_board;
 mod p322_coin_change;
-mod p518_coin_change_ii;
+mod p518_coin_change_ii;
+mod p2642_design_graph_with_shortest_path_calculator;

src/problem/p2642_design_graph_with_shortest_path_calculator.rs

@@ -0,0 +1,82 @@
+/**
+ * [2642] Design Graph With Shortest Path Calculator
+ */
+pub struct Solution {}
+
+// submission codes start here
+use std::{cmp::Reverse, collections::BinaryHeap};
+
+struct Graph {
+    graph: Vec<Vec<(usize, i32)>>,
+}
+
+/**
+ * `&self` means the method takes an immutable reference.
+ * If you need a mutable reference, change it to `&mut self` instead.
+ */
+impl Graph {
+    fn new(n: i32, edges: Vec<Vec<i32>>) -> Self {
+        let n = n as usize;
+
+        let mut graph = vec![vec![]; n];
+
+        for edge in &edges {
+            let x = edge[0] as usize;
+            let y = edge[1] as usize;
+
+            graph[x].push((y, edge[2]));
+        }
+
+        Graph { graph }
+    }
+
+    fn add_edge(&mut self, edge: Vec<i32>) {
+        let x = edge[0] as usize;
+        let y = edge[1] as usize;
+
+        self.graph[x].push((y, edge[2]));
+    }
+
+    fn shortest_path(&self, node1: i32, node2: i32) -> i32 {
+        let (start, end) = (node1 as usize, node2 as usize);
+        let mut queue = BinaryHeap::new();
+        let mut distances = vec![i32::MAX; self.graph.len()];
+        distances[start] = 0;
+        queue.push((Reverse(0), start));
+
+        while !queue.is_empty() {
+            let (cost, now) = queue.pop().unwrap();
+
+            if now == end {
+                return cost.0;
+            }
+
+            for &(next, dis) in &self.graph[now] {
+                if distances[next] > cost.0 + dis {
+                    distances[next] = cost.0 + dis;
+                    queue.push((Reverse(distances[next]), next));
+                }
+            }
+            
+        }
+
+        -1
+    }
+}
+
+/**
+ * Your Graph object will be instantiated and called as such:
+ * let obj = Graph::new(n, edges);
+ * obj.add_edge(edge);
+ * let ret_2: i32 = obj.shortest_path(node1, node2);
+ */
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2642() {}
+}