Binge watching

input/code.cpp: In function 'void solve()':
input/code.cpp:22:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     while(indexa < a.size() and indexb < b.size()) {
      |           ~~~~~~~^~~~~~~~~~
input/code.cpp:22:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     while(indexa < a.size() and indexb < b.size()) {
      |                                 ~~~~~~~^~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;

void solve() {
    int n; 
    cin >> n;
    vector<long long> a;
    vector<long long> b;
    
    while (n > 0) {
        n--;
        int l, r;
        cin >> l >> r;
        a.push_back(l);
        b.push_back(r);
    }
    sort(a.begin(), a.end());
    sort(b.begin(), b.end());
    
    int res = 0;
    int indexa = 0, indexb = 0;
    while(indexa < a.size() and indexb < b.size()) {
        if (b[indexb] <= a[indexa]) {
            res++;
            indexb++;
        } else {
            indexa++;
        }
    }
    cout << res + 1;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    solve();

    return 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: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED