Apartments

input/code.cpp: In function 'void Test()':
input/code.cpp:23:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   23 |     freopen("temp\\in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
input/code.cpp: In function 'int main()':
input/code.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf("%d%d%d", &n, &m, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
input/code.cpp:30:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
input/code.cpp:32:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         scanf("%d", &b[i]);
      |...

#include<iostream>
#include<cstdio>
#include<algorithm>
typedef long long LL;

const int N=200005;
int n, m, k;
int a[N], b[N];

inline int Compare(const int& cur_human, const int& cur_house)
{
    if(cur_human > n)
        return -1;
    if(b[cur_house] < a[cur_human]-k)
        return -1;
    if(b[cur_house] > a[cur_human]+k)
        return 1;
    return 0;
}

void Test()
{
    freopen("temp\\in.txt", "r", stdin);
}
int main()
{
    // Test();
    scanf("%d%d%d", &n, &m, &k);
    for(int i=1; i<=n; i++)
        scanf("%d", &a[i]);
    for(int i=1; i<=m; i++)
        scanf("%d", &b[i]);

    std::sort(b+1, b+m+1);
    std::sort(a+1, a+m+1);

    int ans =0, cur = 1; // cursor of human
    for(int i=1; i<=m; i++)
    {
        // Scan the apartments
        while(Compare(cur, i) == 1)
            cur++;
        if(Compare(cur, i) == 0)
            ans++, cur++;
    }

    printf("%d", ans);
    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: WRONG ANSWER

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED