Ball in Berland Codeforces

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long int
#define ld long double
#define pb push_back
#define p_b pop_back
#define si stack<int>
#define sll stack<ll>
#define sc stack<char>
#define vi vector<int>
#define vll vector<ll>
#define mii map<int, int>
#define msi map<string, int>
#define mci map<char, int>
#define qc queue<char>
#define qi queue<int>
#define qll queue<ll>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin >> t;
    while(t--){
        ld a, b, k;
        cin >> a >> b >> k;
        ld tot = k*(k-1)/2;
        map<ld, ld> boys, girls;
        for(int i = 0; i < k; i++){
            ld x;
            cin >> x;
            boys[x]++;
        }
        for(int i = 0; i < k; i++){
            ld x;
            cin >> x;
            girls[x]++;
        }

        if(tot == 0){
            cout << "0\n";
        } else{
            for(auto i = boys.begin(); i != boys.end(); i++){
                if(i->second > 1){
                    tot -= (i->second)*(i->second-1)/2;
                }
            }
            for(auto i = girls.begin(); i != girls.end(); i++){
                if(i->second > 1){
                    tot -= (i->second)*(i->second-1)/2;
                }
            }

            cout << fixed << setprecision(0) << tot << "\n";
        }
    }
    return 0;
}