제출 #1086599

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1086599		daoquanglinh2007	Passport (JOI23_passport)	C++17	0 / 100	808 ms	830968 KiB

passport

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pii pair <int, int>
#define fi first
#define se second
#define mp make_pair
#define isz(a) (int)(a).size()
 
const int NM = 2500, inf = 1e9+7;
 
int ntest = 1;
int N, Q, L[NM+5], R[NM+5], bestL[NM+5][NM+5], bestR[NM+5][NM+5];
vector <pair <pii, int> > adj[NM+5][NM+5];
deque <pii> q;
int dist[NM+5][NM+5];
 
void solve(){
    cin >> N;
    for (int i = 1; i <= N; i++)
        cin >> L[i] >> R[i];
    for (int i = 1; i <= N; i++){
        bestL[i][i] = bestR[i][i] = i;
        for (int j = i+1; j <= N; j++){
            if (mp(L[j], -R[j]) < mp(L[bestL[i][j-1]], -R[bestL[i][j-1]])) bestL[i][j] = j;
            else bestL[i][j] = bestL[i][j-1];

            if (mp(R[j], -L[j]) > mp(R[bestR[i][j-1]], -L[bestR[i][j-1]])) bestR[i][j] = j;
            else bestR[i][j] = bestR[i][j-1];
        }
        for (int j = i; j <= N; j++){
            int x = min(i, L[bestL[i][j]]);
            adj[x][j].push_back(mp(mp(i, j), 1));
            int y = max(j, R[bestR[i][j]]);
            adj[i][y].push_back(mp(mp(i, j), 1));
            dist[i][j] = +inf;
        }
    }
    for (int i = 1; i <= N; i++)
        for (int j = i; j <= N; j++){
            if (i+1 <= j) adj[i+1][j].push_back(mp(mp(i, j), 0));
            if (j-1 >= i) adj[i][j-1].push_back(mp(mp(i, j), 0));
        }
    dist[1][N] = 0;
    q.push_back(mp(1, N));
    while (!q.empty()){
        int l = q.front().fi, r = q.front().se; q.pop_front();
        for (pair <pii, int> p : adj[l][r]){
            if (dist[l][r]+p.se >= dist[p.fi.fi][p.fi.se]) continue;
            dist[p.fi.fi][p.fi.se] = dist[l][r]+p.se;
            if (p.se == 0) q.push_front(p.fi);
            else q.push_back(p.fi);
        }
    }
    cin >> Q;
    while (Q--){
        int X; cin >> X;
        cout << (dist[X][X] == +inf ? -1 : dist[X][X]) << '\n';
    }
}
 
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    //cin >> ntest;
    while (ntest--){
        solve();
    }
 
#ifdef daoquanglinh2007
    cerr << '\n';
    for (int i = 1; i <= 100; i++) cerr << '=';
    cerr << "\nExecution time: " << 1*(clock()) << " ms\n";
#endif
    return 0;
}

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