test.c++

// you can use includes, for example:
// #include <algorithm>

// you can write to stdout for debugging purposes, e.g.
// cout << "this is a debug message" << endl;
struct Point
    {
        Point(char tag, int x, int y)
        :m_tag(tag)
        ,m_dist(long(x)*long(x) + long(y)*long(y))
        {

        }
        friend bool operator<(Point a, Point b)
        {
            if(a.m_dist == b.m_dist)
            {
                return a.m_tag < b.m_tag;
            }
            return a.m_dist < b.m_dist;
        }
        char m_tag;
        long m_dist;
    };
int solution(string &s, vector<int> &x, vector<int> &y) 
{
    vector<Point> points;
    int n = x.size();
    points.reserve(n);
    for(int i = 0;i<n;++i)
    {
        points.emplace_back(s[i],x[i],y[i]);
    }
    sort(points.begin(),points.end());
    bool found[26] = {};
    int total = 0;
    found[points[0].m_tag] = true;
    long current = points[0].m_dist;
    int tentative = 0;
    for(int i = 1;i<n;++i)
    {
        if(current == points[i].m_dist)
        {
            if(found[points[i].m_tag])
            {
                break;
            }
            found[points[i].m_tag] = true;
            ++tentative;
            continue;
        }
        total += tentative;
        if(found[points[i].m_tag])
        {
            return total;
        }
        tentative = 1;
        found[points[i].m_tag - 'A'] = true;
        current = points[i].m_dist;
    }
    return total;
}