20240810 Finished

src/problem/mod.rs

@@ -200,3 +200,4 @@ mod p139_word_break;
 mod p300_longest_increasing_subsequence;
 mod p120_triangle;
 mod p64_minimum_path_sum;
+mod p63_unique_paths_ii;

src/problem/p63_unique_paths_ii.rs

@@ -0,0 +1,55 @@
+/**
+ * [63] Unique Paths II
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn unique_paths_with_obstacles(obstacle_grid: Vec<Vec<i32>>) -> i32 {
+        let (m, n) = (obstacle_grid.len(), obstacle_grid[0].len());
+        let mut dp = vec![vec![0; n]; m];
+        dp[0][0] = if obstacle_grid[0][0] == 1 {
+            0
+        } else {
+            1
+        };
+
+        for i in 0..m {
+            for j in 0..n {
+                if obstacle_grid[i][j] == 1 {
+                    continue;
+                }
+
+                let mut value = 0;
+                if i != 0 {
+                    value += dp[i - 1][j];
+                }
+
+                if j != 0 {
+                    value += dp[i][j - 1];
+                }
+
+                if i != 0 || j != 0 {
+                    dp[i][j] = value;
+                }
+            }
+        }
+
+        dp[m - 1][n - 1]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_63() {
+        assert_eq!(2, Solution::unique_paths_with_obstacles(vec![vec![0, 0, 0], vec![0, 1, 0], vec![0, 0, 0]]));
+        assert_eq!(0, Solution::unique_paths_with_obstacles(vec![vec![1]]));
+    }
+}