Apartments

#include "bits/stdc++.h"

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

#define F first
#define S second
#define PB push_back
#define MP make_pair

#define REP(i,a,b) for (int i = a; i < b; i++)


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

    int n, m, k;
    cin >> n >> m >> k;
    vector<int> des(n);
    vector<int> apa(m);

    REP(i, 0, n) {
        cin >> des[i];
    }

    REP(i, 0, m) {
        cin >> apa[i];
    }

    int i = 0;
    int j = 0;
    int c = 0;

    std::sort(apa.begin(), apa.end());
    std::sort(des.begin(), des.end());
    
    while(i < n && j < m) {
        if(abs(apa[j]-des[i]) <= k) {c++; j++; i++;}
        else if(apa[j] > des[i]) {i++;}
        else {j++;}
    }

    cout << c << "\n";

    return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED