171:Excel 表列序号

src/main/java/leetcode/editor/cn/ExcelSheetColumnNumber.java

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+//给你一个字符串 columnTitle ，表示 Excel 表格中的列名称。返回该列名称对应的列序号。 
+//
+// 
+//
+// 例如， 
+//
+// 
+//    A -> 1
+//    B -> 2
+//    C -> 3
+//    ...
+//    Z -> 26
+//    AA -> 27
+//    AB -> 28 
+//    ...
+// 
+//
+// 
+//
+// 示例 1: 
+//
+// 
+//输入: columnTitle = "A"
+//输出: 1
+// 
+//
+// 示例 2: 
+//
+// 
+//输入: columnTitle = "AB"
+//输出: 28
+// 
+//
+// 示例 3: 
+//
+// 
+//输入: columnTitle = "ZY"
+//输出: 701 
+//
+// 示例 4: 
+//
+// 
+//输入: columnTitle = "FXSHRXW"
+//输出: 2147483647
+// 
+//
+// 
+//
+// 提示： 
+//
+// 
+// 1 <= columnTitle.length <= 7 
+// columnTitle 仅由大写英文组成 
+// columnTitle 在范围 ["A", "FXSHRXW"] 内 
+// 
+// Related Topics 数学 字符串 
+// 👍 260 👎 0
+
+package leetcode.editor.cn;
+
+//171:Excel 表列序号
+public class ExcelSheetColumnNumber {
+    public static void main(String[] args) {
+        //测试代码
+        Solution solution = new ExcelSheetColumnNumber().new Solution();
+    }
+
+    //力扣代码
+    //leetcode submit region begin(Prohibit modification and deletion)
+    class Solution {
+        public int titleToNumber(String columnTitle) {
+            char[] chs = columnTitle.toCharArray();
+            int result = 0;
+            int size = chs.length - 1;
+            int mul = 1;
+            for (int i = 0; i <= size; i++) {
+                int num = chs[size - i] - 'A' + 1;
+                result += num * mul;
+                mul *= 26;
+            }
+            return result;
+        }
+    }
+//leetcode submit region end(Prohibit modification and deletion)
+
+}

src/main/java/leetcode/editor/cn/ExcelSheetColumnNumber.md

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+<p>给你一个字符串&nbsp;<code>columnTitle</code> ，表示 Excel 表格中的列名称。返回该列名称对应的列序号。</p>
+
+<p>&nbsp;</p>
+
+<p>例如，</p>
+
+<pre>
+    A -&gt; 1
+    B -&gt; 2
+    C -&gt; 3
+    ...
+    Z -&gt; 26
+    AA -&gt; 27
+    AB -&gt; 28 
+    ...
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>示例 1:</strong></p>
+
+<pre>
+<strong>输入:</strong> columnTitle = "A"
+<strong>输出:</strong> 1
+</pre>
+
+<p><strong>示例&nbsp;2:</strong></p>
+
+<pre>
+<strong>输入: </strong>columnTitle = "AB"
+<strong>输出:</strong> 28
+</pre>
+
+<p><strong>示例&nbsp;3:</strong></p>
+
+<pre>
+<strong>输入: </strong>columnTitle = "ZY"
+<strong>输出:</strong> 701</pre>
+
+<p><strong>示例 4:</strong></p>
+
+<pre>
+<strong>输入: </strong>columnTitle = "FXSHRXW"
+<strong>输出: </strong>2147483647
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>提示：</strong></p>
+
+<ul>
+	<li><code>1 &lt;= columnTitle.length &lt;= 7</code></li>
+	<li><code>columnTitle</code> 仅由大写英文组成</li>
+	<li><code>columnTitle</code> 在范围 <code>["A", "FXSHRXW"]</code> 内</li>
+</ul>
+<div><div>Related Topics</div><div><li>数学</li><li>字符串</li></div></div>\n<div><li>👍 260</li><li>👎 0</li></div>