feat: add dart solution to lc problem: No.1423 (#2561)

No.1423.Maximum Points You Can Obtain from Cards

Author: yanglbme

solution/1400-1499/1423.Maximum Points You Can Obtain from Cards/README.md

@@ -278,6 +278,21 @@ class Solution {
 }
 ```
 
+```dart
+class Solution {
+  int maxScore(List<int> cardPoints, int k) {
+    int n = cardPoints.length;
+    int s = cardPoints.sublist(n - k).reduce((a, b) => a + b);
+    int ans = s;
+    for (int i = 0; i < k; ++i) {
+      s += cardPoints[i] - cardPoints[n - k + i];
+      ans = s > ans ? s : ans;
+    }
+    return ans;
+  }
+}
+```
+
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solution/1400-1499/1423.Maximum Points You Can Obtain from Cards/README_EN.md

@@ -264,6 +264,21 @@ class Solution {
 }
 ```
 
+```dart
+class Solution {
+  int maxScore(List<int> cardPoints, int k) {
+    int n = cardPoints.length;
+    int s = cardPoints.sublist(n - k).reduce((a, b) => a + b);
+    int ans = s;
+    for (int i = 0; i < k; ++i) {
+      s += cardPoints[i] - cardPoints[n - k + i];
+      ans = s > ans ? s : ans;
+    }
+    return ans;
+  }
+}
+```
+
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