From 42c0d1b5a73503da31b47951d2ab4810420d4796 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 18 Jul 2020 18:42:30 +0800
Subject: import(solutions): Add problem 917 .

---
 works/solutions/cpp/917.cpp | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 works/solutions/cpp/917.cpp

(limited to 'works/solutions/cpp')

diff --git a/works/solutions/cpp/917.cpp b/works/solutions/cpp/917.cpp
new file mode 100644
index 0000000..d01d795
--- /dev/null
+++ b/works/solutions/cpp/917.cpp
@@ -0,0 +1,45 @@
+#include <string>
+#include <cctype>
+#include <utility>
+
+using std::string;
+
+class Solution
+{
+public:
+    string reverseOnlyLetters(string s)
+    {
+        if (s.empty())
+            return s;
+
+        auto front = s.rend();
+        auto back = s.end();
+
+        bool move_front = true;
+        while (true)
+        {
+            if (move_front)
+            {
+                if (std::isalpha(*--front))
+                {
+                    move_front = false;
+                }
+            }
+            else
+            {
+                if (std::isalpha(*--back))
+                {
+                    std::swap(*front, *back);
+                    move_front = true;
+                }
+            }
+
+            if (front.base() == back)
+            {
+                break;
+            }
+        }
+
+        return s;
+    }
+};
-- 
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