You are given a string s. Your task is to remove all digits by doing this operation repeatedly: Delete the first digit and the closest non-digit character to its left. Return the resulting string after removing all digits.
Example 1:
Input: s = “abc”
Output: “abc”
Explanation:
There is no digit in the string.
Example 2:
Input: s = “cb34”
Output: “”
Explanation:
First, we apply the operation on s[2], and s becomes "c4".
Then we apply the operation on s[1], and s becomes "".
Constraints:
1 <= s.length <= 100sconsists only of lowercase English letters and digits.- The input is generated such that it is possible to delete all digits.
string clearDigits(string s) {
stack<char> sc;
string result = "";
for( char c : s ){
if( c >= 48 && c <=57 ){
sc.pop();
} else
sc.push(c);
}
while( !sc.empty() ){
result+= sc.top();
sc.pop();
}
reverse( result.begin(), result.end());
return result;
}