Envío 4933

Código

/// Write by Daniel Perez .PERAPRO
#include<bits/stdc++.h>

using namespace std;
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define pb push_back
#define ff first
#define ss second
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using vi=vector<int>;
using vl=vector<ll>;
using pii=pair<int,int>;
char el = '\n';
char esp = ' ';

template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }

ostream& operator<<(ostream& os, const vector<int> &v){
    for(auto const &i: v){
        os<<i<<" ";
    }
    os<<'\n';
    return os;
}
string yes="Yes";
string no="No";


int main(){
	fast_io;
	/*
 	freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);
    */
    int clases;
    cin>>clases;
    priority_queue<pii, vector<pii>, greater<pii>> q;
    for(int i=0;i<clases;i++){// 0 close?
        string open, close;
        cin>>open>>close;
        q.push({stoi(open.substr(0,2) + open.substr(3,2)),1});
        q.push({stoi(close.substr(0,2) + close.substr(3,2)),0});
    }
    int ans=0;
    int cur=0;
    while(q.size()){
        int tm=q.top().ff;
        int type=q.top().ss;
        q.pop();
        if(type)
            cur++;
        else 
            cur--;
        ckmax(ans,cur);
    }
    cout<<ans<<el;
}

/*

*/