20240828 finished.

src/problem/mod.rs

@@ -218,3 +218,4 @@ mod p3145_find_products_of_elements_of_big_array;
 mod p3146_permutation_difference_between_two_strings;
 mod p698_partition_to_k_equal_sum_subsets;
 mod p3134_find_the_median_of_the_uniqueness_array;
+mod p3144_minimum_substring_partition_of_equal_character_frequency;

src/problem/p3144_minimum_substring_partition_of_equal_character_frequency.rs

@@ -0,0 +1,49 @@
+/**
+ * [3144] Minimum Substring Partition of Equal Character Frequency
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+use std::collections::HashMap;
+
+impl Solution {
+    pub fn minimum_substrings_in_partition(s: String) -> i32 {
+        let s: Vec<char> = s.chars().collect();
+        let n = s.len();
+        
+        let mut dp = vec![i32::MAX;n + 1];
+        let mut char_count = HashMap::new();
+        dp[0] = 0;
+        
+        for i in 1..=n {
+            let mut max_count = 0;
+            char_count.clear();
+            
+            for j in (1..=i).rev() {
+                let entry = char_count.entry(s[j - 1]).or_insert(0);
+                *entry += 1;
+                max_count = max_count.max(*entry);
+                
+                if max_count * char_count.len() == i - j + 1 && dp[j - 1] != i32::MAX {
+                    dp[i] = dp[i].min(dp[j - 1] + 1);
+                }
+            }
+        }
+        
+        dp[n]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3144() {
+        assert_eq!(3, Solution::minimum_substrings_in_partition("fabccddg".to_owned()));
+        assert_eq!(2, Solution::minimum_substrings_in_partition("abababaccddb".to_owned()));
+    }
+}