Binge watching

#include <iostream>
#include <vector>
#include <functional>

void printNewLine(){std::cout << "\n";}
template<typename T>
void print(T a){std::cout << a;}
template<typename T>
void println(T a){std::cout << a << "\n";}


std::tuple<int> readInt1(){
    int a;
    std::cin >> a;
    return {a};
}


std::vector<int> readVecInt(int n){
    std::vector<int> arr(n);
    for (int i = 0; i < n; i++){
        int a;
        std::cin >> a;
        arr[i] = a;
    }
    return arr;
}




#include <set>
#include <algorithm>

void movie(){
    auto [n] = readInt1();
    auto arr = readVecInt(2*n);
    for (int i = 0; i < n; i++){
        int temp = arr[2*i+1];
        arr[2*i+1] = arr[2*i];
        arr[2*i] = temp;
    }
    int* s = &arr[0];
    std::sort((long*)(s),(long*)(s)+n);
    for (int i = 0; i < n; i++){
        int temp = arr[2*i+1];
        arr[2*i+1] = arr[2*i];
        arr[2*i] = temp;
    }
    int time = 0;
    int num = 0;
    for (int i = 0; i < n; i++){
        if (time <= arr[2*i]){
            time = arr[2*i+1];
            num += 1;
        }
    }
    println(num);
}


int main() {
    //carManufacturing();
    //bottle();
    movie();
    exit(0);
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED