Additional data structures

public static boolean isUniqueChars(String str) {
    long checker1 = 0;
    long checker2 = 0;
    long checker3 = 0;
    long checker4 = 0;
    for (int i = 0; i < str.length(); ++i) {
        int val = str.charAt(i);
        int toCheck = val / 64;
        val %= 64;
        switch (toCheck) {
            case 0:
                if ((checker1 & (1L << val)) > 0) {
                    return false;
                }
                checker1 |= (1L << val);
                break;
            case 1:
                if ((checker2 & (1L << val)) > 0) {
                    return false;
                }
                checker2 |= (1L << val);
                break;
            case 2:
                if ((checker3 & (1L << val)) > 0) {
                    return false;
                }
                checker3 |= (1L << val);
                break;
            case 3:
                if ((checker4 & (1L << val)) > 0) {
                    return false;
                }
                checker4 |= (1L << val);
                break;
        }            
    }
    return true;
}

Source: stackoverflow.com

Similar codes

1 vote270 views1 answer
Typescript filter list by property
TypeScript
0 vote269 views1 answer
Number of elements in circular queue
TypeScript
0 vote277 views1 answer
Typescript tutorial nodejs
TypeScript
0 vote275 views1 answer
Angular typescript filter array group by attribute
TypeScript
0 vote269 views1 answer
If driver element exists python
TypeScript
0 vote277 views1 answer
Typescript default public or private
TypeScript
0 vote301 views1 answer
Write getter angular
TypeScript
7 votes267 views5 answers
How to multiply two lists in python
TypeScript
4 votes315 views1 answer
Usestate as number
TypeScript
0 vote333 views1 answer
How to find specific elements from a list in java
TypeScript