We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. Sparse Arrays
  2. Discussions

Sparse Arrays

Sort by

recency

|

244 Discussions

|

  • juanp766
     + 0 comments

    Java using a map to save the frequencies. This solution iterates each list only once.

        public static List<Integer> matchingStrings(List<String> strings, List<String> queries) {
    // Write your code here
        HashMap<String, Integer> stringsMap = new HashMap<>();
        for(String string : strings){
            if(stringsMap.containsKey(string)){
                stringsMap.put(string, stringsMap.get(string) + 1);
            }else{
                stringsMap.put(string, 1);
            }
        }
        
        ArrayList<Integer> results = new ArrayList<>(queries.size());
        for(String query: queries){
            Integer frequency = stringsMap.get(query);
            results.add(frequency == null ? 0 : frequency);
        }
        return results;
    }

  • sawanpatel2508
     + 0 comments

    Here is the typescript solution for the better time complexity and space complexity. The time complexity over here will be o(n + q). I have created a hash map for the faster retrival of the information: Python:

    def matchingStrings(strings, queries):
    strings_frequency = {}
    for string in strings:
        strings_frequency[string] = strings_frequency.get(string, 0) + 1

    return [strings_frequency.get(query, 0) for query in queries]

  • sawanpatel2508
     + 0 comments

    Here is the typescript solution for the better time complexity and space complexity. The time complexity over here will be o(n + q). I have created a hash map for the faster retrival of the information: Typescript:

    function matchingStrings(strings: string[], queries: string[]): number[] {
  // Write your code here
  const stringsFreq: { [key: string]: number } = {};
  for (const s of strings) {
    stringsFreq[s] = (stringsFreq[s] || 0) + 1;
  }
  return queries.map(q => stringsFreq[q] || 0);
}

  • Pedroh_martini
     + 0 comments

    Guys, the go code won't compile because you guys used strings as a name of a variable in the test code

  • ralu_s_neacsu
     + 0 comments

    GO: your provided code in Go has a bug: you used the name "strings" for a var.