20240729 Finished

src/problem/mod.rs

@@ -188,3 +188,4 @@ mod p190_reverse_bits;
 mod p191_number_of_1_bits;
 mod p136_single_number;
 mod p137_single_number_ii;
+mod p201_bitwise_and_of_numbers_range;

src/problem/p201_bitwise_and_of_numbers_range.rs

@@ -0,0 +1,32 @@
+/**
+ * [201] Bitwise AND of Numbers Range
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn range_bitwise_and(left: i32, right: i32) -> i32 {
+        let mut right = right;
+
+        while left < right {
+            right = right & (right - 1);
+        }
+        
+        right
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_201() {
+        assert_eq!(4, Solution::range_bitwise_and(5, 7));
+        assert_eq!(0, Solution::range_bitwise_and(0, 0));
+    }
+}