non-decreasing-array

non-decreasing-array/sol.rs

@@ -0,0 +1,19 @@
+impl Solution {
+    pub fn check_possibility(nums: Vec<i32>) -> bool {
+        nums.windows(2)
+            .scan(i32::MIN, |max, n| {
+                *max = n[0].max(*max);
+                Some(n[1] < *max)
+            })
+            .filter(|&result| result)
+            .count() <= 1 ||
+        nums.windows(2)
+            .rev()
+            .scan(i32::MAX, |min, n| {
+                *min = n[1].min(*min);
+                Some(n[0] > *min)
+            })
+            .filter(|&result| result)
+            .count() <= 1
+    }
+}