20240415 Finished

src/problem/mod.rs

@@ -102,4 +102,5 @@ mod p122_best_time_to_buy_and_sell_stock_ii;
 mod p55_jump_game;
 mod p45_jump_game_ii;
 mod p274_h_index;
-mod p380_insert_delete_getrandom_o1;
+mod p380_insert_delete_getrandom_o1;
+mod p238_product_of_array_except_self;

src/problem/p238_product_of_array_except_self.rs

@@ -0,0 +1,45 @@
+/**
+ * [238] Product of Array Except Self
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn product_except_self(nums: Vec<i32>) -> Vec<i32> {
+        let mut result = vec![1; nums.len()];
+
+        for i in 1..nums.len() {
+            result[i] = result[i - 1] * nums[i - 1];
+        }
+
+        let mut suffix = 1;
+
+        for i in (0..nums.len() - 1).rev() {
+            suffix *= nums[i + 1];
+
+            result[i] *= suffix;
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_238() {
+        assert_eq!(
+            vec![24, 12, 8, 6],
+            Solution::product_except_self(vec![1, 2, 3, 4])
+        );
+        assert_eq!(
+            vec![0, 0, 9, 0, 0],
+            Solution::product_except_self(vec![-1, 1, 0, -3, 3])
+        );
+    }
+}