20240301 Finished

src/problem/mod.rs

@@ -60,3 +60,4 @@ mod p889_construct_binary_tree_from_preorder_and_postorder_traversal;
 mod p2867_count_valid_paths_in_a_tree;
 mod p2673_make_costs_of_paths_equal_in_a_binary_tree;
 mod p2581_count_number_of_possible_root_nodes;
+mod p2369_check_if_there_is_a_valid_partition_for_the_array;

src/problem/p2369_check_if_there_is_a_valid_partition_for_the_array.rs

@@ -0,0 +1,53 @@
+/**
+ * [2369] Check if There is a Valid Partition For The Array
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn valid_partition(nums: Vec<i32>) -> bool {
+        let mut dp = vec![false; nums.len()];
+        dp[1] = nums[0] == nums[1];
+
+        for i in 2..nums.len() {
+            // 首先判断用两个相同的值
+            dp[i] = dp[i - 2] && nums[i] == nums[i - 1];
+
+            if dp[i] {
+                continue;
+            }
+
+            // 然后判断三个相同的值
+            if i >= 3 {
+                dp[i] = dp[i - 3]
+                    && ((nums[i - 2] == nums[i - 1] && nums[i - 1] == nums[i])
+                        || (nums[i - 2] + 1 == nums[i - 1] && nums[i - 1] + 1 == nums[i]));
+            } else {
+                dp[i] = (nums[i - 2] == nums[i - 1] && nums[i - 1] == nums[i])
+                    || (nums[i - 2] + 1 == nums[i - 1] && nums[i - 1] + 1 == nums[i]);
+            }
+        }
+
+        dp[nums.len() - 1]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2369() {
+        assert!(Solution::valid_partition(vec![4, 4, 4, 5, 6]));
+        assert!(!Solution::valid_partition(vec![4, 4, 4, 5]));
+        assert!(Solution::valid_partition(vec![
+            803201, 803201, 803201, 803201, 803202, 803203
+        ]));
+        assert!(!Solution::valid_partition(vec![
+            993335, 993336, 993337, 993338, 993339, 993340, 993341
+        ]));
+    }
+}