Add problem 680 .

1 files changed, 35 insertions, 0 deletions

diff --git a/cpp/680.cpp b/cpp/680.cpp
new file mode 100644
index 0000000..21d150f
--- /dev/null
+++ b/cpp/680.cpp
@@ -0,0 +1,35 @@
+#include <string>

+

+using std::string;

+

+bool strict_palindrome(string::const_iterator left, string::const_iterator right)

+{

+    while (left < right)

+    {

+        if (*left != *right)

+            return false;

+        ++left;

+        --right;

+    }

+    return true;

+}

+

+class Solution

+{

+public:

+    bool validPalindrome(string s)

+    {

+        string::const_iterator left = s.cbegin();

+        string::const_iterator right = s.cend() - 1;

+

+        while (left < right)

+        {

+            if (*left != *right)

+                return strict_palindrome(left, right - 1) || strict_palindrome(left + 1, right);

+

+            ++left;

+            --right;

+        }

+        return true;

+    }

+};