is there a misprint in option? what is vector>data??..should it be vector<pair<int,int>>data where any of data[i].first or data[i].second can be i and arr[i]
is there a misprint in option? what is vector>data??..should it be vector<pair<int,int>>data where any of data[i].first or data[i].second can be i and arr[i]