20241022 finished.

src/problem/mod.rs

@@ -271,3 +271,4 @@ mod p3191_minimum_operations_to_make_binary_array_elements_equal_to_one_i;
 mod p3192_minimum_operations_to_make_binary_array_elements_equal_to_one_ii;
 mod p908_smallest_range_i;
 mod p910_smallest_range_ii;
+mod p3184_count_pairs_that_form_a_complete_day_i;

src/problem/p3184_count_pairs_that_form_a_complete_day_i.rs

@@ -0,0 +1,40 @@
+/**
+ * [3184] Count Pairs That Form a Complete Day I
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn count_complete_day_pairs(hours: Vec<i32>) -> i32 {
+        use std::collections::HashMap;
+
+        let mut map = HashMap::new();
+        let mut result = 0;
+
+        for hour in hours {
+            let hour = hour % 24;
+            if let Some(&c) = map.get(&((24 - hour) % 24)) {
+                result += c;
+            }
+            let entry = map.entry(hour).or_insert(0);
+            *entry += 1;
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3184() {
+        assert_eq!(3, Solution::count_complete_day_pairs(vec![72, 48, 24, 3]));
+        assert_eq!(2, Solution::count_complete_day_pairs(vec![12, 12, 30, 24, 24]));
+    }
+}