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  1. Prepare
  2. Algorithms
  3. Sorting
  4. Lily's Homework
  5. Discussions

Lily's Homework

  • PranavBansal
     + 2 comments

    I have done the same thing but still i am not getting the answer

    int lilysHomework(vector<int> arr) {
    int swaps=0;
    vector<int> sorted;
    sorted=arr;
    sort(sorted.begin(),sorted.end());
    map<int,int> count;
    for(int i=0;i<arr.size();i++)
        count[arr[i]]=i;

    for(int i=0;i<arr.size();i++){
        if(arr[i]!=sorted[i]){
            swaps++;
            int temp1=arr[i],temp2=sorted[i];
            swap(arr[i],arr[count[temp2]]);
            count[temp1]=count[temp2];
        }
    }

    return swaps;
}

    For the input 

    3 4 2 5 1

    I am doing these swaps

    1 4 2 5 3 
1 2 4 5 3 
1 2 3 5 4 
1 2 3 4 5

    Total swaps here are 4 but the expected outcome is 2

    What am I doing wrong here?