From 25f8703b391e5ff3ed9edf11bd25c6a6464c6939 Mon Sep 17 00:00:00 2001
From: jackfiled <xcrenchangjun@outlook.com>
Date: Thu, 1 May 2025 15:29:57 +0800
Subject: [PATCH] 20250501 finished.

---
 src/problem/mod.rs                            |   2 +
 ..._maximum_number_of_tasks_you_can_assign.rs | 108 ++++++++++++++++++
 2 files changed, 110 insertions(+)
 create mode 100644 src/problem/p2071_maximum_number_of_tasks_you_can_assign.rs

diff --git a/src/problem/mod.rs b/src/problem/mod.rs
index b4d0100..e2e8e85 100644
--- a/src/problem/mod.rs
+++ b/src/problem/mod.rs
@@ -626,3 +626,5 @@ mod p3392_count_subarrays_of_length_three_with_a_condition;
 
 mod p2302_count_subarrays_with_score_less_than_k;
 mod p2962_count_subarrays_where_max_element_appears_at_least_k_times;
+
+mod p2071_maximum_number_of_tasks_you_can_assign;
diff --git a/src/problem/p2071_maximum_number_of_tasks_you_can_assign.rs b/src/problem/p2071_maximum_number_of_tasks_you_can_assign.rs
new file mode 100644
index 0000000..a89af34
--- /dev/null
+++ b/src/problem/p2071_maximum_number_of_tasks_you_can_assign.rs
@@ -0,0 +1,108 @@
+/**
+ * [2071] Maximum Number of Tasks You Can Assign
+ */
+pub struct Solution {}
+
+// submission codes start here
+use std::collections::VecDeque;
+
+impl Solution {
+    pub fn max_task_assign(
+        mut tasks: Vec<i32>,
+        mut workers: Vec<i32>,
+        pills: i32,
+        strength: i32,
+    ) -> i32 {
+        let (n, m) = (tasks.len(), workers.len());
+
+        tasks.sort_unstable();
+        workers.sort_unstable();
+
+        let check = |middle: usize| -> bool {
+            // 注意middle的溢出问题
+            if middle < 1 {
+                return true;
+            }
+
+            let mut p = pills;
+            let mut worker_queue = VecDeque::new();
+            let mut ptr = m - 1;
+
+            for i in (0..=middle - 1).rev() {
+                while ptr >= m - middle && workers[ptr] + strength >= tasks[i] {
+                    worker_queue.push_front(workers[ptr]);
+
+                    if ptr == 0 {
+                        break;
+                    }
+                    ptr -= 1;
+                }
+
+                if worker_queue.is_empty() {
+                    return false;
+                }
+
+                let last = worker_queue.back().unwrap();
+
+                if *last >= tasks[i] {
+                    worker_queue.pop_back();
+                } else {
+                    if p == 0 {
+                        return false;
+                    }
+
+                    p -= 1;
+                    worker_queue.pop_front();
+                }
+            }
+
+            return true;
+        };
+
+        let (mut left, mut right) = (1, m.min(n));
+        let mut result = 0;
+
+        while left <= right {
+            let middle = (left + right) / 2;
+            if check(middle) {
+                result = middle;
+                left = middle + 1;
+            } else {
+                right = middle - 1;
+            }
+        }
+
+        result as i32
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2071() {
+        assert_eq!(
+            1,
+            Solution::max_task_assign(vec![35], vec![83, 20, 4, 66], 3, 41)
+        );
+        assert_eq!(
+            3,
+            Solution::max_task_assign(vec![3, 2, 1], vec![0, 3, 3], 1, 1)
+        );
+        assert_eq!(
+            1,
+            Solution::max_task_assign(vec![5, 4], vec![0, 0, 0], 1, 5)
+        );
+        assert_eq!(
+            2,
+            Solution::max_task_assign(vec![10, 15, 30], vec![0, 10, 10, 10, 10], 3, 10)
+        );
+        assert_eq!(
+            3,
+            Solution::max_task_assign(vec![5, 9, 8, 5, 9], vec![1, 6, 4, 2, 6], 1, 5)
+        );
+    }
+}