20240720 Finished

src/problem/mod.rs

@@ -179,3 +179,4 @@ mod p74_search_a_2d_matrix;
 mod p33_search_in_rotated_sorted_array;
 mod p34_find_first_and_last_position_of_element_in_sorted_array;
 mod p153_find_minimum_in_rotated_sorted_array;
+mod p215_kth_largest_element_in_an_array;

src/problem/p215_kth_largest_element_in_an_array.rs

@@ -0,0 +1,37 @@
+/**
+ * [215] Kth Largest Element in an Array
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn find_kth_largest(nums: Vec<i32>, k: i32) -> i32 {
+        use std::{cmp::Reverse, collections::BinaryHeap};
+
+        let k = k as usize;
+        let mut heap = BinaryHeap::<Reverse<i32>>::with_capacity(k);
+
+        for i in nums {
+            if heap.len() == k && heap.peek().unwrap().0 < i {
+                heap.pop();
+                heap.push(Reverse(i));
+            } else if heap.len() < k {
+                heap.push(Reverse(i));
+            }
+        }
+
+        heap.pop().unwrap().0
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_215() {}
+}