Submission #851498

#	Time	Username	Problem	Language	Result	Execution time	Memory
851498		owoovo	Passport (JOI23_passport)	C++14	0 / 100	2039 ms	348 KiB

passport

#include<bits/stdc++.h>
using namespace std;
int bit[200010],n,qu;
void mo(int pos,int x){
    while(pos<=n){
        bit[pos]=max(bit[pos],x);
        pos+=pos&(-pos);
    }
    return;
}
int q(int pos){
    int ans=0;
    while(pos){
        ans=max(ans,bit[pos]);
        pos+=pos&(-pos);
    }
    return ans;
}
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++){
        int a,b;
        cin>>a>>b;
        mo(i,b);
    }
    cin>>qu;
    int ans=0,now=1;
    while(now!=n){
        ans++;
        int x=q(now);
        if(x==now){
            cout<<"-1\n";
            return 0;
        }
        now=q(now);
    }
    cout<<ans<<"\n";
    return 0;
}

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