## Algorithm

Problem Name: 168. Excel Sheet Column Title

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"
```

Constraints:

• `1 <= columnNumber <= 231 - 1`

## Code Examples

### #1 Code Example with C Programming

```Code - C Programming```

``````
char* convertToTitle(int n) {
char *s;
int sz, l, k;
int i, j;

sz = 100;
s = malloc(sz * sizeof(char));
//assert(s);
l = 0;
while (n) {
if (sz == l) {
sz *= 2;
s = realloc(s, sz * sizeof(char));
//assert(s);
}
k = (n - 1) % 26;
s[l ++] = 'A' + k;
n = (n - 1) / 26;
}
s[l] = 0;
for (i = 0, j = l - 1; i  <  j; i ++, j --) {
k = s[i];
s[i] = s[j];
s[j] = k;
}
return s;
}
``````
Copy The Code &

Input

cmd
columnNumber = 1

Output

cmd
"A"

### #2 Code Example with C++ Programming

```Code - C++ Programming```

``````
class Solution {
public:
string convertToTitle(int n) {
string res;
char c;
while(n){
c = 'A' + (n - 1) % 26;
res = c + res;
n = (n - 1) / 26;
}
return res;
}
};
``````
Copy The Code &

Input

cmd
columnNumber = 1

Output

cmd
"A"

### #2 Code Example with C++ Another Programming

```Code - C++ Programming```

``````
class Solution {
public:
string convertToTitle(int n) {
string res = "";
while(n){
res.push_back('A' + (n - 1)%26);
n = (n - 1) / 26;
}
reverse(res.begin(), res.end());
return res;
}
};
``````
Copy The Code &

Input

cmd
columnNumber = 28

Output

cmd
"AB"

### #4 Code Example with Javascript Programming

```Code - Javascript Programming```

``````
const convertToTitle = function(n) {
if (n === 0) {
return ''
}
const res = [];
const hash = {};
('ABCDEFGHIJKLMNOPQRSTUVWXYZ').split('').forEach((el,idx) => {
hash[idx] = el
})

while(n > 0) {
n--;
res.unshift(hash[n % 26]);
n = Math.floor(n / 26);
}

return res.join('')
};
``````
Copy The Code &

Input

cmd
columnNumber = 28

Output

cmd
"AB"

### #5 Code Example with Python Programming

```Code - Python Programming```

``````
class Solution:
def convertToTitle(self, n: int) -> str:
char = str()
while n > 0:
if n % 26 == 0:
char += "Z"
n = n // 26 - 1
else:
char += chr(n % 26 + ord("@"))
n = n // 26
return char[::-1]
``````
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Input

cmd
columnNumber = 701

### #6 Code Example with C# Programming

```Code - C# Programming```

``````
using System.Text;

namespace LeetCode
{
public class _0168_ExcelSheetColumnTitle
{
public string ConvertToTitle(int n)
{
const string chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var sb = new StringBuilder();
while (n > 0)
{
n--;

var d = n % 26;
sb.Insert(0, chars[d]);
n /= 26;
}

return sb.ToString();
}
}
}
``````
Copy The Code &

Input

cmd
columnNumber = 701

Output

cmd
"ZY"