Problem 1024: Video Stitching

video-stitching/.gitignore

@@ -0,0 +1 @@
+/target

video-stitching/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "video-stitching"
+version = "0.1.0"

video-stitching/Cargo.toml

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+[package]
+name = "video-stitching"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

video-stitching/src/main.rs

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+fn video_stitching(clips: Vec<Vec<i32>>, time: i32) -> i32 {
+    let mut arr = clips.clone();
+    arr.sort_by(|a, b|
+        if a[0] == b[0] {
+            b[1].cmp(&a[1])
+        }
+        else {
+            a[0].cmp(&b[0])
+        }
+    );
+
+    if arr[0][0] != 0 {
+        return -1;
+    }
+
+    let mut current_index = 0;
+    let mut current_time = arr[0][1];
+    let mut count = 1;
+
+    while current_time < time {
+        let mut max: Option<&Vec<i32>> = None;
+        let mut max_index: Option<usize> = None;
+
+        for (index, slice) in arr.iter().enumerate() {
+            if index <= current_index {
+                continue;
+            }
+
+            if slice[0] > current_time {
+                break;
+            }
+
+            if max.is_none() || slice[1] > max.unwrap()[1] {
+                max = Some(slice);
+                max_index = Some(index);
+            }
+        }
+
+        if let (Some(slice), Some(index)) = (max, max_index) {
+            current_time = slice[1];
+            current_index = index;
+            count += 1;
+        }
+        else {
+            return -1;
+        }
+    }
+
+    count
+}
+
+fn main() {
+    println!("{}", video_stitching(vec![vec![0,1]], 1));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_simple() {
+        let clips = vec![vec![0,1], vec![1,3], vec![3,7]];
+        assert_eq!(video_stitching(clips, 7), 3);
+    }
+
+    #[test]
+    fn test_ex1() {
+        let clips = vec![
+            vec![0,2], vec![4,6], vec![8,10],
+            vec![1,9], vec![1,5], vec![5,9],
+        ];
+        assert_eq!(video_stitching(clips, 10), 3);
+    }
+
+    #[test]
+    fn test_ex2() {
+        let clips = vec![vec![0,1], vec![1,2]];
+        assert_eq!(video_stitching(clips, 5), -1);
+    }
+
+    #[test]
+    fn test_ex3() {
+        let clips = vec![
+            vec![0,1], vec![6,8], vec![0,2], vec![5,6],
+            vec![0,4], vec![0,3], vec![6,7], vec![1,3],
+            vec![4,7], vec![1,4], vec![2,5], vec![2,6],
+            vec![3,4], vec![4,5], vec![5,7], vec![6,9],
+        ];
+        assert_eq!(video_stitching(clips, 9), 3);
+    }
+
+    #[test]
+    fn test_n48() {
+        let clips = vec![
+            vec![ 8,10], vec![17,39], vec![18,19], vec![ 8,16],
+            vec![13,35], vec![33,39], vec![11,19], vec![18,35],
+        ];
+        assert_eq!(video_stitching(clips, 20), -1);
+    }
+}