some dp problems

CSES - CSES Problem Set/Sorting_And_Searching/Apartments.cpp

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+//  Apartments
+
+#include<bits/stdc++.h>
+using ll = long long;
+using namespace std;
+
+int main() {
+    int n, m;
+    ll k; cin >> n >> m >> k;
+    vector<ll> as(n);
+    for (auto &e: as) cin >> e;
+    vector<ll> bs(m);
+    for (auto &e: bs) cin >> e;
+    std::sort(as.begin(), as.end(), greater<ll>());
+    std::sort(bs.begin(), bs.end(), greater<ll>());
+
+    int count = 0;
+
+    while (as.size()) {
+        int val = as.back();
+        as.pop_back();
+        while (bs.size()) {
+            int val2 = bs.back();
+            if (val2 > val + k) break;
+            bs.pop_back();
+            if (val2 + k >= val && val2 - k <= val) {
+                count++;
+                break;
+            }
+        }
+    }
+
+    cout << count << endl;
+
+    return 0;
+}