20240716 Finished

src/problem/mod.rs

@@ -174,4 +174,5 @@ mod p79_word_search;
 mod p108_convert_sorted_array_to_binary_search_tree;
 mod p53_maximum_subarray;
 mod p918_maximum_sum_circular_subarray;
-mod p35_search_insert_position;
+mod p35_search_insert_position;
+mod p74_search_a_2d_matrix;

src/problem/p74_search_a_2d_matrix.rs

@@ -0,0 +1,68 @@
+/**
+ * [74] Search a 2D Matrix
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn search_matrix(matrix: Vec<Vec<i32>>, target: i32) -> bool {
+        let m = matrix.len();
+        let n = matrix[0].len();
+
+        // 左闭右开区间
+        let (mut lower, mut upper) = (0, m);
+
+        while lower < upper {
+            let middle = (upper - lower) / 2 + lower;
+            
+            // WTF?
+            if lower == middle {
+                break;
+            }
+
+            if target < matrix[middle][0] {
+                upper = middle;
+            } else {
+                lower = middle;
+            }
+        }
+
+        let (mut left, mut right) = (0, n);
+
+        while left < right {
+            let middle = (right - left) / 2 + left;
+
+            if target > matrix[lower][middle] {
+                left = middle + 1;
+            } else {
+                right = middle;
+            }
+        }
+
+        if left < n {
+            matrix[lower][left] == target
+        } else { 
+            false
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_74() {
+        let matrix = vec![vec![1, 3, 5, 7], vec![10, 11, 16, 20], vec![23, 30, 34, 60]];
+        
+        assert!(Solution::search_matrix(matrix, 3));
+        
+        let matrix = vec![vec![1]];
+        
+        assert!(!Solution::search_matrix(matrix, 2));
+    }
+}