Apartments

#include <bits/stdc++.h>

using namespace std;

int main() {
    int n, m, k;
    cin >> n >> m >> k;

    vector<int> des;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        des.push_back(a);
    }
    vector<int> sizes;
    for (int i = 0; i < m; i++) {
        int b;
        cin >> b;
        sizes.push_back(b);
    }

    sort(sizes.begin(), sizes.end());

    vector<bool> used(m, false);
    int res = 0;
    for (auto a : des) {
        int l = 0, r = m - 1;
        while (l <= r) {
            int mid = (l + r) / 2;
            if (used[mid] != true && a - k <= sizes[mid] &&
                a + k >= sizes[mid]) {
                used[mid] = true;
                res++;
            }
            if (sizes[mid] > a) {
                r = mid - 1;
            } else {
                l = mid + 1;
            }
        }
    }
    cout << res << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: WRONG ANSWER

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED