another 4 sorting and searching problems

CSES - CSES Problem Set/Movie_Festival.cpp

@@ -0,0 +1,28 @@
+//  Movie Festival
+
+#include<bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    int n; cin >> n;
+    vector<pair<ll, ll>> movies(n);
+    for (auto &p: movies) {
+        ll a, b; cin >> a >> b;
+        p = {b, a};
+    }
+    int count = 0;
+    int current_time = 0;
+    std::sort(movies.begin(), movies.end());
+    for (auto &[end, start]: movies) {
+        if (start >= current_time) {
+            current_time = end;
+            count++;
+        }
+    }
+
+    cout << count << endl;
+
+    return 0;
+}