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Author: assassint2017

Excel Sheet Column Number/Excel_Sheet_Column_Number.cpp

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+// 注意如何更加高效的，不使用pow函数来完成
+// Runtime: 8 ms, faster than 99.60% of C++ online submissions for Excel Sheet Column Number.
+// Memory Usage: 7.9 MB, less than 99.32% of C++ online submissions for Excel Sheet Column Number.
+
+class Solution 
+{
+public:
+    int titleToNumber(string s) 
+    {
+        // 讲道理如果这里不使用long而使用int回导致溢出
+        long sum = 0;
+        for (int i = 0; i < s.length(); i++)    
+            sum = sum * 26 + s[i] - 'A' + 1;
+        return sum;
+    }
+};

Excel Sheet Column Number/Excel_Sheet_Column_Number.py

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+# Runtime: 52 ms, faster than 99.35% of Python3 online submissions for Excel Sheet Column Number.
+# Memory Usage: 12.5 MB, less than 85.71% of Python3 online submissions for Excel Sheet Column Number.
+
+class Solution:
+    def titleToNumber(self, s: 'str') -> 'int':
+        sum = 0
+        for i in range(len(s)):
+            sum = sum * 26 + ord(s[i]) - 64
+        return sum