Submission #888761

#	Time	Username	Problem	Language	Result	Execution time	Memory
888761		vjudge1	Passport (JOI23_passport)	C++17	22 / 100	2076 ms	205140 KiB

passport

/*

author : abushbandit
contest : ---

*/

#include "bits/stdc++.h"

using namespace std;

#define int long long

void solve(int tc){
	
	int n;
	cin >> n;
	vector<pair<int,int>> a(n + 1);
	for(int i = 1;i <= n;i++){
		int l,r;
		cin >> l >> r;
		a[i] = {l,r};
	}
	
 	
    int q;
	cin >> q;
	for(int i = 0;i < q;i++){
        int x;
        cin >> x;
        if(x == 1){
        	
        	int i = 1,lst = a[1].second,cnt = 0;
        	bool check = 0;
        	while(true){
        		cnt++;
        		int mx = 0;
        		while(i <= n && i <= lst){
        			mx = max(mx,a[i].second);
        			i++;
				}
				if(i > n){
					break;
				} else if(lst < mx){
					lst = mx;
				} else{
					check = 1;
					break;
				}
			}
        	
        	if(check){
        		cout << -1 << "\n";
			} else{
				cout << cnt << "\n";
			}
        	
        	break;
        	
		} else{
			vector<vector<int>> dis(n + 1, vector<int> (n + 1,1e18));
	        vector<vector<int>> vis(n + 1, vector<int> (n + 1,0));
	 
	        set<vector<int>> st;
	        dis[a[x].first][a[x].second] = 1;
	       	st.insert({1,a[x].first,a[x].second});
	        while(!st.empty()){
	            int l = (*st.begin())[1], r = (*st.begin())[2];
	            st.erase(st.begin());
	            if(vis[l][r])continue;
	            vis[l][r] = 1;
	            for(int i = l;i <= r;i++){
	                for(int j = r;j <= max(r,a[i].second);j++){
	                    for(int k = l;k >= min(l,a[i].first);k--){
	                        if(dis[l][r] + 1 < dis[k][j]){
	                            st.insert({dis[l][r] + 1,k,j});
	                            dis[k][j] = dis[l][r] + 1;
	                        }
	                    }
	                }
	            }
	        }
	        if(dis[1][n] == 1e18){
	        	cout << "-1\n";
			} else{
				cout << dis[1][n] << "\n";
			}
		}
	        
    }
	
}

signed main(){

//	start_file("");

	ios_base::sync_with_stdio(0);
	cin.tie(0);cout.tie(0);

	int test_cases = 1;
//	cin >> test_cases ;
	for(int tc = 1;tc <= test_cases;++ tc){
		solve(tc);
	}	

}

/*



*/

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