20210202 Finished

src/problem/mod.rs

@@ -35,3 +35,4 @@ mod p514_freedom_trail;
 mod p2808_minimum_seconds_to_equalize_a_circular_array;
 mod p2670_find_the_distinct_difference_array;
 mod lcp24_nums_game;
+mod p1686_stone_game_vi;

src/problem/p1686_stone_game_vi.rs

@@ -0,0 +1,58 @@
+/**
+ * [1686] Stone Game VI
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+struct Stone {
+    sum: i32,
+    alice: i32,
+    bob: i32
+}
+
+impl Solution {
+    pub fn stone_game_vi(alice_values: Vec<i32>, bob_values: Vec<i32>) -> i32 {
+        let mut stones: Vec<Stone> = alice_values.iter()
+            .zip(bob_values.iter())
+            .map(|(a,b)| Stone {
+                sum: *a + *b,
+                alice: *a,
+                bob: *b
+            })
+            .collect();
+
+        stones.sort_unstable_by(|a, b| b.sum.cmp(&a.sum));
+
+        let alice_sum: i32 = stones.iter()
+            .step_by(2)
+            .map(|s| s.alice)
+            .sum();
+        let bob_sum: i32 = stones.iter()
+            .skip(1)
+            .step_by(2)
+            .map(|s| s.bob)
+            .sum();
+
+        if alice_sum > bob_sum {
+            1
+        } else if alice_sum < bob_sum {
+            -1
+        } else {
+            0
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1686() {
+        assert_eq!(Solution::stone_game_vi(vec![1,3], vec![2,1]), 1);
+    }
+}