some dp problems

CSES - CSES Problem Set/Sorting_And_Searching/Restaurant_Customers.cpp

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+//  Restaurant Customers
+
+#include<bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    int n; cin >> n;
+    map<ll, int> m;
+    for (int i{}; i < n; i++) {
+        ll a, b;
+        cin >> a >> b;
+        m[a]++;
+        m[b]--;
+    }
+    int max_count = 0;
+    int count = 0;
+    for (auto &[t, c]: m) {
+        count += c;
+        max_count = max(max_count, count);
+    }
+    cout << max_count << endl;
+    return 0;
+}