[Leetcode] 171. Excel Sheet Column Number 解题报告
2017-06-08 14:38
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题目:
Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
思路:
从最右边向最左边扫描。最右边的基数是1,依次向左基数以26倍增大。最后把结果累加起来即可。
代码:
class Solution {
public:
int titleToNumber(string s) {
if (s.length() == 0) {
return 0;
}
int ret = 0, radix = 1;
for (int i = s.length() - 1; i >=0; --i) {
int value = s[i] - 'A' + 1;
ret += radix * value;
radix *= 26;
}
return ret;
}
};
Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28
思路:
从最右边向最左边扫描。最右边的基数是1,依次向左基数以26倍增大。最后把结果累加起来即可。
代码:
class Solution {
public:
int titleToNumber(string s) {
if (s.length() == 0) {
return 0;
}
int ret = 0, radix = 1;
for (int i = s.length() - 1; i >=0; --i) {
int value = s[i] - 'A' + 1;
ret += radix * value;
radix *= 26;
}
return ret;
}
};
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