Given an integer columnNumber, return its corresponding column title as it appears in an Excel sheet.
For example:
A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...Example 1:
Input: columnNumber = 1
Output: "A"Example 2:
Input: columnNumber = 28
Output: "AB"Example 3:
Input: columnNumber = 701
Output: "ZY"Example 4:
Input: columnNumber = 2147483647
Output: "FXSHRXW"class Solution {
public:
string convertToTitle(int columnNumber) {
string s;
int val = 0;
while(columnNumber > 0){
val = columnNumber%26;
if(val == 0){
val = 26;
}
s += (val + 64);
columnNumber -= val;
columnNumber /= 26;
}
reverse(s.begin(), s.end());
return s;
}
};最後一個字是由number%26決定，/26則是往前移動一位的意思
Runtime: 0 ms, faster than 100.00% of C++ online submissions for Excel Sheet Column Title.
Memory Usage: 5.8 MB, less than 59.63% of C++ online submissions for Excel Sheet Column Title.
