20241123 finished.

src/problem/mod.rs

@@ -332,3 +332,5 @@ mod p3244_shortest_distance_after_road_addition_queries_ii;
 mod p3248_snake_in_matrix;
 
 mod p3233_find_the_count_of_numbers_which_are_not_special;
+
+mod p3238_find_the_number_of_winning_players;

src/problem/p3238_find_the_number_of_winning_players.rs

@@ -0,0 +1,58 @@
+/**
+ * [3238] Find the Number of Winning Players
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn winning_player_count(n: i32, pick: Vec<Vec<i32>>) -> i32 {
+        use std::collections::HashMap;
+        let n = n as usize;
+
+        let mut player = vec![HashMap::new(); n];
+        for p in pick {
+            let (p, b) = (p[0] as usize, p[1]);
+
+            let mut entry = player[p].entry(b).or_insert(0);
+            *entry += 1;
+        }
+
+        player
+            .iter()
+            .enumerate()
+            .filter_map(|(i, map)| {
+                if map.iter().any(|(_, v)| *v > i) {
+                    Some(())
+                } else {
+                    None
+                }
+            })
+            .count() as i32
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3238() {
+        assert_eq!(
+            2,
+            Solution::winning_player_count(
+                4,
+                vec![
+                    vec![0, 0],
+                    vec![1, 0],
+                    vec![1, 0],
+                    vec![2, 1],
+                    vec![2, 1],
+                    vec![2, 0]
+                ]
+            )
+        );
+    }
+}