20240805 Finished

src/problem/mod.rs

@@ -194,4 +194,5 @@ mod p172_factorial_trailing_zeroes;
 mod p69_sqrtx;
 mod p50_powx_n;
 mod p149_max_points_on_a_line;
-mod p70_climbing_stairs;
+mod p70_climbing_stairs;
+mod p198_house_robber;

src/problem/p198_house_robber.rs

@@ -0,0 +1,51 @@
+/**
+ * [198] House Robber
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn rob(nums: Vec<i32>) -> i32 {
+        let n = nums.len();
+        let mut dp = Vec::with_capacity(n);
+
+        if n == 1 {
+            return nums[0];
+        }
+
+        let mut result = nums[0];
+        dp.push(result);
+
+        for i in 1..n {
+            let mut last = 0;
+
+            for j in 0..i - 1 {
+                last = last.max(dp[j]);
+            }
+
+            last = dp[i - 1].max(last + nums[i]);
+            dp.push(last);
+            result = result.max(last);
+        }
+
+        result
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_198() {
+        assert_eq!(4, Solution::rob(vec![1, 2, 3, 1]));
+        assert_eq!(12, Solution::rob(vec![2, 7, 9, 3, 1]));
+        assert_eq!(2, Solution::rob(vec![2, 1]));
+        assert_eq!(2, Solution::rob(vec![2]));
+        assert_eq!(4, Solution::rob(vec![2, 1, 1, 2]));
+    }
+}