20241009 finished.

src/problem/mod.rs

@@ -257,4 +257,5 @@ 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 p1436_destination_city;
+mod p1436_destination_city;
+mod p3171_find_subarray_with_bitwise_or_closest_to_k;

src/problem/p3171_find_subarray_with_bitwise_or_closest_to_k.rs

@@ -0,0 +1,69 @@
+/**
+ * [3171] Find Subarray With Bitwise OR Closest to K
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+use std::cmp::Ordering;
+
+impl Solution {
+    pub fn minimum_difference(nums: Vec<i32>, k: i32) -> i32 {
+        let n = nums.len();
+        let mut bits_max_pos = vec![None; 31];
+        let mut pos_to_bit = Vec::with_capacity(31);
+        let mut result = i32::MAX;
+
+        for i in 0..n {
+            for j in 0..=30 {
+                if nums[i] >> j & 1 == 1 {
+                    bits_max_pos[j] = Some(i)
+                }
+            }
+
+            pos_to_bit.clear();
+            for j in 0..=30 {
+                if let Some(pos) = bits_max_pos[j] {
+                    pos_to_bit.push((pos, j));
+                }
+            }
+
+            pos_to_bit.sort_by(|a, b| {
+                match b.0.cmp(&a.0) {
+                    Ordering::Less => { Ordering::Less }
+                    Ordering::Equal => { b.1.cmp(&a.1) }
+                    Ordering::Greater => { Ordering::Greater }
+                }
+            });
+
+            let mut value = 0;
+            let (mut left, mut right) = (0, 0);
+
+            while right < pos_to_bit.len() {
+                while right < pos_to_bit.len() && pos_to_bit[right].0 == pos_to_bit[left].0 {
+                    value |= 1 << pos_to_bit[right].1;
+                    right += 1;
+                }
+
+                result = result.min((value - k).abs());
+                left = right;
+            }
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3171() {
+        assert_eq!(0, Solution::minimum_difference(vec![1, 2, 4, 5], 3));
+        assert_eq!(1, Solution::minimum_difference(vec![1, 3, 1, 3], 2));
+        assert_eq!(9, Solution::minimum_difference(vec![1], 10));
+    }
+}