Submission #730894

#	Time	Username	Problem	Language	Result	Execution time	Memory
730894		grogu	Passport (JOI23_passport)	C++14	0 / 100	1 ms	212 KiB

passport

#define here cerr<<"===========================================\n"
#define dbg(x) cerr<<#x<<": "<<x<<endl;
#include <bits/stdc++.h>
#define ld double
#define ll long long
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define endl '\n'
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define all(a) a.begin(),a.end()
using namespace std;

#define maxn 200005
ll n,q;
pll a[maxn];
ll mx[maxn];
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
    cin >> n;
    for(ll i = 1;i<=n;i++) cin >> a[i].fi >> a[i].sc;
    for(ll i = 1;i<=n;i++) mx[i] = max(mx[i-1],a[i].sc);
    ll ans = 0;
    cin >> q;
    cin >> q;
    ll i = 1;
    ll r = a[i].sc;
    while(i!=n){
        i = r;
        if(r==mx[r]){
            cout<<-1<<endl;
            return 0;
        }
        r = mx[r];
        ans++;
    }
    cout<<ans<<endl;
	return 0;
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46