Traffic jam

input/code.cpp: In function 'void solve()':
input/code.cpp:76:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     for(int i = 0; i < cars.size(); i++){
      |                    ~~^~~~~~~~~~~~~

/*
    Road to Freedom
*/

#include <bits/stdc++.h>

using namespace std;

#define ll             long long int
#define F              first
#define S              second
#define pb             push_back
#define si             set <int>
#define vi             vector <int>
#define pii            pair <int, int>
#define vpi            vector <pii>
#define vpp            vector <pair<int, pii>>
#define mii            map <int, int>
#define mpi            map <pii, int>
#define spi            set <pii>
#define endl           "\n"
#define sz(x)          ((int) x.size())
#define all(p)         p.begin(), p.end()
#define double         long double
#define que_max        priority_queue <int>
#define que_min        priority_queue <int, vi, greater<int>>
#define bug(...)       __f (#__VA_ARGS__, __VA_ARGS__)
#define print(a)       for(auto x : a) cout << x << " "; cout << endl
#define print1(a)      for(auto x : a) cout << x.F << " " << x.S << endl
#define print2(a,x,y)  for(int i = x; i < y; i++) cout<< a[i]<< " "; cout << endl
#define REP(i,a,b)     for (int i = a; i <= b; i++)

inline int power(int a, int b)
{
    int x = 1;
    while (b)
    {
        if (b & 1) x *= a;
        a *= a;
        b >>= 1;
    }
    return x;
}

template <typename Arg1>
void __f (const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << endl; }
template <typename Arg1, typename... Args>
void __f (const char* names, Arg1&& arg1, Args&&... args)
{
    const char* comma = strchr (names + 1, ',');
    cout.write (names, comma - names) << " : " << arg1 << " | "; __f (comma + 1, args...);
}

const int N = 200005;

bool comp(pair<int,int> a, pair<int,int> b) { 
    if(a.first == b.first) return a.second > b.second;
    return a.first < b.first;
}

void solve() {
    int n; cin >> n;
    vector<pair<int, int>> cars(n*2);

    for(int i = 0; i < n;i++){
        int l, r; cin >> l >> r;
        cars[i] = {l, 1}; // 1 for entry
        cars[i+n] = {r, -1}; // -1 for exit
    }

    sort(cars.begin(), cars.end(), comp);

    int ans = -1;
    int tmp = 0;

    for(int i = 0; i < cars.size(); i++){
        tmp += cars[i].second;
        ans = max(ans, tmp);
    }

    cout << ans;

}

int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #ifndef ONLINE_JUDGE
        freopen("input.txt",  "r",  stdin);
        freopen("output.txt", "w", stdout);
    #endif

    clock_t z = clock();

    int t = 1;
    // cin >> t;
    while (t--) solve();

    cerr << "Run Time : " << ((double)(clock() - z) / CLOCKS_PER_SEC);

    return 0;
}

Test 1

Verdict: ACCEPTED

Run Time : 3.9e-05

Test 2

Verdict: ACCEPTED

Run Time : 3.9e-05

Test 3

Verdict: ACCEPTED

Run Time : 3.8e-05

Test 4

Verdict: ACCEPTED

Run Time : 3.8e-05

Test 5

Verdict: ACCEPTED

Run Time : 3.8e-05

Test 6

Verdict: ACCEPTED

Run Time : 3.9e-05

Test 7

Verdict: ACCEPTED

Run Time : 3.7e-05

Test 8

Verdict: ACCEPTED

Run Time : 3.9e-05

Test 9

Verdict: ACCEPTED

Run Time : 3.9e-05

Test 10

Verdict: ACCEPTED

Run Time : 3.8e-05

Test 11

Verdict: ACCEPTED

Run Time : 4e-05

Test 12

Verdict: ACCEPTED

Run Time : 4e-05

Test 13

Verdict: ACCEPTED

Run Time : 4e-05

Test 14

Verdict: ACCEPTED

Run Time : 4.1e-05

Test 15

Verdict: ACCEPTED

Run Time : 4.1e-05

Test 16

Verdict: ACCEPTED

Run Time : 4.2e-05

Test 17

Verdict: ACCEPTED

Run Time : 4e-05

Test 18

Verdict: ACCEPTED

Run Time : 4e-05

Test 19

Verdict: ACCEPTED

Run Time : 4.3e-05

Test 20

Verdict: ACCEPTED

Run Time : 4.1e-05

Test 21

Verdict: ACCEPTED

Run Time : 7.5e-05

Test 22

Verdict: ACCEPTED

Run Time : 7.5e-05

Test 23

Verdict: ACCEPTED

Run Time : 7.4e-05

Test 24

Verdict: ACCEPTED

Run Time : 8e-05

Test 25

Verdict: ACCEPTED

Run Time : 7.4e-05

Test 26

Verdict: ACCEPTED

Run Time : 7.4e-05

Test 27

Verdict: ACCEPTED

Run Time : 7.4e-05

Test 28

Verdict: ACCEPTED

Run Time : 7.3e-05

Test 29

Verdict: ACCEPTED

Run Time : 7.4e-05

Test 30

Verdict: ACCEPTED

Run Time : 7.3e-05

Test 31

Verdict: ACCEPTED

Run Time : 0.000109

Test 32

Verdict: ACCEPTED

Run Time : 0.000108

Test 33

Verdict: ACCEPTED

Run Time : 0.00011

Test 34

Verdict: ACCEPTED

Run Time : 0.00011

Test 35

Verdict: ACCEPTED

Run Time : 0.000109

Test 36

Verdict: ACCEPTED

Run Time : 0.000108

Test 37

Verdict: ACCEPTED

Run Time : 0.000108

Test 38

Verdict: ACCEPTED

Run Time : 0.000112

Test 39

Verdict: ACCEPTED

Run Time : 0.000108

Test 40

Verdict: ACCEPTED

Run Time : 0.000109

Test 41

Verdict: ACCEPTED

Run Time : 0.000419

Test 42

Verdict: ACCEPTED

Run Time : 0.000418

Test 43

Verdict: ACCEPTED

Run Time : 0.00042

Test 44

Verdict: ACCEPTED

Run Time : 0.000416

Test 45

Verdict: ACCEPTED

Run Time : 0.000418

Test 46

Verdict: ACCEPTED

Run Time : 0.000649

Test 47

Verdict: ACCEPTED

Run Time : 0.000415

Test 48

Verdict: ACCEPTED

Run Time : 0.000415

Test 49

Verdict: ACCEPTED

Run Time : 0.000415

Test 50

Verdict: ACCEPTED

Run Time : 0.000416

Test 51

Verdict: ACCEPTED

Run Time : 0.004311

Test 52

Verdict: ACCEPTED

Run Time : 0.004302

Test 53

Verdict: ACCEPTED

Run Time : 0.004285

Test 54

Verdict: ACCEPTED

Run Time : 0.004298

Test 55

Verdict: ACCEPTED

Run Time : 0.004325

Test 56

Verdict: ACCEPTED

Run Time : 0.004318

Test 57

Verdict: ACCEPTED

Run Time : 0.004301

Test 58

Verdict: ACCEPTED

Run Time : 0.004305

Test 59

Verdict: ACCEPTED

Run Time : 0.004308

Test 60

Verdict: ACCEPTED

Run Time : 0.004282

Test 61

Verdict: ACCEPTED

Run Time : 0.04645

Test 62

Verdict: ACCEPTED

Run Time : 0.047376

Test 63

Verdict: ACCEPTED

Run Time : 0.046479

Test 64

Verdict: ACCEPTED

Run Time : 0.046201

Test 65

Verdict: ACCEPTED

Run Time : 0.046277

Test 66

Verdict: ACCEPTED

Run Time : 0.049551

Test 67

Verdict: ACCEPTED

Run Time : 0.046281

Test 68

Verdict: ACCEPTED

Run Time : 0.046255

Test 69

Verdict: ACCEPTED

Run Time : 0.046419

Test 70

Verdict: ACCEPTED

Run Time : 0.046287