Non Repeating Character | GFG POTD 1st Dec 2024 | JAVA | C++

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C++ Code :
char nonRepeatingChar(string &s) {
// Your code here
vector arr(26, 0); // Array to store frequency of each character
// Count the frequency of each character
for (char c : s) {
++arr[c - 'a'];
}
// Find the first character with frequency 1
for (char c : s) {
if (arr[c - 'a'] == 1) {
return c;
}
}
return '$'; // Return '$' if no unique character is found
}

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JAVA Code :
static char nonRepeatingChar(String s) {
// Your code here
int[] arr = new int[26];
for(char c : s.toCharArray()){
++arr[c - 'a'];
}

for(char c : s.toCharArray()){
if(arr[c - 'a'] == 1){
return c;
}
}
return '$';
}