20240327 Finished

src/problem/mod.rs

@@ -86,3 +86,4 @@ mod p2549_count_distinct_numbers_on_board;
 mod p322_coin_change;
 mod p518_coin_change_ii;
 mod p2642_design_graph_with_shortest_path_calculator;
+mod p2580_count_ways_to_group_overlapping_ranges;

src/problem/p2580_count_ways_to_group_overlapping_ranges.rs

@@ -0,0 +1,75 @@
+/**
+ * [2580] Count Ways to Group Overlapping Ranges
+ */
+pub struct Solution {}
+
+// submission codes start here
+struct Range {
+    start: i32,
+    end: i32,
+}
+
+impl Solution {
+    pub fn count_ways(ranges: Vec<Vec<i32>>) -> i32 {
+        let mut ranges: Vec<Range> = ranges
+            .iter()
+            .map(|a| {
+                return Range {
+                    start: a[0],
+                    end: a[1],
+                };
+            })
+            .collect();
+
+        ranges.sort_unstable_by_key(|x| x.start);
+
+        let mut merged_ranges = Vec::with_capacity(ranges.len());
+
+        let mut i = 0;
+        let mut last: Option<&mut Range> = None;
+
+        while i < ranges.len() {
+            if let Some(last_range) = last {
+                while i < ranges.len() && last_range.end >= ranges[i].start {
+                    last_range.end = last_range.end.max(ranges[i].end);
+                    i += 1;
+                }
+
+                if i >= ranges.len() {
+                    break;
+                }
+            }
+
+            merged_ranges.push(Range {
+                start: ranges[i].start,
+                end: ranges[i].end,
+            });
+            last = merged_ranges.last_mut();
+            i += 1;
+        }
+
+        let mut result = 1;
+
+        for _ in 0..merged_ranges.len() as i32 {
+            result = result * 2 % 1_000_000_007;
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_2580() {
+        assert_eq!(2, Solution::count_ways(vec![vec![6, 10], vec![5, 15]]));
+        assert_eq!(
+            4,
+            Solution::count_ways(vec![vec![1, 3], vec![10, 20], vec![2, 5], vec![4, 8]])
+        );
+    }
+}