Submission #833442

#	Time	Username	Problem	Language	Result	Execution time	Memory
833442		vjudge1	Exam (eJOI20_exam)	C++17	12 / 100	1077 ms	4820 KiB

exam

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<long long, long long>
#define pii pair<int,int>
#define fi first
#define se second
const ll MOD=1e9+7;


void solve(){
    int n;
    cin >> n;
    int ans=0;
    ll robot[n];
    ll building[n];
    bool subtask2=true;
    priority_queue<pii, vector<pii>, greater<pii> > order;
    for(int i=0; i<n; i++){
        cin >> robot[i];
    }
    for(int i=0; i<n; i++){
        cin >> building[i];
        order.push(make_pair(building[i],i));
        if(subtask2 && i>0){
            if(building[i]!=building[i-1]){
                subtask2=false;
            }
        }
    }
    if(subtask2){
        bool visited[n];
        memset(visited,0,sizeof(visited));
        for(int i=0; i<n; i++){
            if(robot[i]==building[i] && !visited[i]){
                visited[i]=true;
                ans++;
                ll idx=i+1;
                while(robot[idx]<=robot[i] && idx<n){
                    visited[idx]=true;
                    ans++;
                    idx++;
                }
                idx=i-1;
                while(robot[idx]<=robot[i] && idx>=0){
                    visited[idx]=true;
                    ans++;
                    idx--;
                }
            }
        }
    }else{
        bool bisa[n];
        memset(bisa,0,sizeof(bisa));
        for(int i=0; i<n; i++){
            int cur=order.top().se;
            order.pop();
            ll idx=cur;
            ll debt=0;
            ll nambah=0;
            bool ada=false;
            while(robot[idx]<=building[cur] && idx<n){
                if(building[idx]==building[cur]){
                    nambah++;
                }
                if(robot[idx]==building[cur]){
                    ada=true;
                    break;
                }
                if(bisa[idx]){
                    debt++;
                }
                idx++;
            }
            if(ada){
                if(nambah>debt){
                    for(int j=cur; j<=idx; j++){
                        robot[j]=building[cur];
                        if(robot[j]==building[j]){
                            bisa[j]=true;
                        }else{
                            bisa[j]=false;
                        }
                    }
                }
            }
            debt=0;
            nambah=0;
            if(ada){
                idx=cur-1;
            }else{
                idx=cur;
            }
            while(robot[idx]<=building[cur] && idx>=0){
                if(building[idx]==building[cur]){
                    nambah++;
                }
                if(robot[idx]==building[cur]){
                    ada=true;
                    break;
                }
                if(bisa[idx]){
                    debt++;
                }
                idx--;
            }
            if(ada){
                if(nambah>debt){
                    for(int j=cur; j>=idx; j--){
                        robot[j]=building[cur];
                        if(robot[j]==building[j]){
                            bisa[j]=true;
                        }else{
                            bisa[j]=false;
                        }
                    }
                }
            }
        }
        for(int j=0; j<n; j++){
                if(robot[j]==building[j]){
                    ans++;
                }
            }
    }
    cout << ans << endl;
    return;
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int q=1;
    for(int i=0; i<q; i++){
        solve();
    }
    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 12 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 16
• Subtask 6: 0 / 22