Submission #1356350

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Source Code Expand

#include "bits/stdc++.h"
#include <regex>
#define _USE_MATH_DEFINES
#include <math.h>

using namespace std;

#ifndef _DEBUG
#define main_ main
#endif
#define FOR(i,s,e) for (int i = int(s); i < int(e); ++i)
#define REP(i,e) FOR(i,0,e)
#define INF (INT_MAX/2)
#define EPS (1.0e-8)
#define LINF (LONG_MAX/2)

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<bool> vb;
typedef vector<string> vs;

template <typename T>
using keyVal = pair<string, T>;
template<typename T>
bool val_greater(const keyVal<T>& left, const keyVal<T>& right) {
	return left.second > right.second;
}

vs split(string str, char sep) {
	vs v; stringstream ss(str); string t;
	while (getline(ss, t, sep)) v.push_back(t);
	return v;
}

int main_() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int NA, NB; cin >> NA >> NB;
	vi A(NA), B(NB);
	FOR(i, 0, NA) cin >> A[i];
	FOR(i, 0, NB) cin >> B[i];
	
	sort(B.begin(), B.end());

	int cnt = 0;
	FOR(i, 0, NA) {
		int a = A[i];
		int l = 0, r = NB - 1;
		int old = -1;
		while (true) {
			int m = l + (r - l) / 2;
			if (m == old) break;
			else old = m;

			if (a == B[m]) {
				cnt++;
				break;
			}
			else if (a < B[m]) {
				r = m;
			}
			else {
				l = m;
			}
		}
	}

	double ans = ((double)cnt) / (NA+NB - cnt);
	cout << setprecision(8) << ans << endl;

	return 0;
}

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