Submission #1103007

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103007		otarius	Passport (JOI23_passport)	C++17	100 / 100	789 ms	115872 KiB

passport

#include <bits/stdc++.h>
#include <bits/extc++.h>
using namespace __gnu_pbds;
using namespace std;

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

#define int long long
// #define int unsigned long long

// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>

void open_file(string filename) {
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}

// const ll mod = 1e9 + 7;
// const ll mod = 998244353;

const ll inf = 1e9;
const ll biginf = 1e18;
const int maxN = 1e6 + 305;

vector<int> g[maxN];
int n, q, d[3][maxN];
int build(int v, int tl, int tr) {
    if (tl == tr) return tl;
    int tm = (tl + tr) / 2;
    int x = build(2 * v, tl, tm);
    int y = build(2 * v + 1, tm + 1, tr);
    g[x].pb(v + n); g[y].pb(v + n);
    return v + n;
}
void update(int v, int tl, int tr, int l, int r, int pos) {
    if (r < tl || tr < l) return;
    if (l <= tl && tr <= r) {
        if (tl == tr) g[tl].pb(pos);
        else g[v + n].pb(pos);
        return;
    } int tm = (tl + tr) / 2;
    update(2 * v, tl, tm, l, r, pos);
    update(2 * v + 1, tm + 1, tr, l, r, pos);
}
void dijkstra(int _) {
    set<pii> st;
    for (int i = 1; i <= 5 * n; i++) {
        if (d[_][i]) st.insert({d[_][i], i});
        else d[_][i] = maxN;
    } while (!st.empty()) {
        pii cur = *st.begin();
        st.erase(st.begin());
        int w = cur.ff, x = cur.sc;
        for (int u : g[x]) {
            if (u <= n && d[_][u] > w + 1) {
                st.erase({d[_][u], u});
                d[_][u] = w + 1;
                st.insert({d[_][u], u});
            } else if (u > n && d[_][u] > w) {
                st.erase({d[_][u], u});
                d[_][u] = w;
                st.insert({d[_][u], u});
            }
        }
    }
}
void solve() {
    cin >> n;
    build(1, 1, n);
    int l[n + 1], r[n + 1];
    for (int i = 1; i <= n; i++) {
        cin >> l[i] >> r[i];
        update(1, 1, n, l[i], r[i], i);
    } for (int i = 1; i <= n; i++)
        if (l[i] == 1) d[1][i] = 1;
    dijkstra(1);
    for (int i = 1; i <= n; i++)
        if (r[i] == n) d[2][i] = 1;
    dijkstra(2);
    for (int i = 1; i <= n; i++)
        d[0][i] = d[1][i] + d[2][i] - 1;
    dijkstra(0);
    cin >> q;
    while (q--) {
        int x; cin >> x; cout << (d[0][x] > n + 5 ? -1 : d[0][x]) << '\n';
    }
}
int32_t main() { 
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    }
    return 0;
}

Compilation message (stderr)

passport.cpp: In function 'void open_file(std::string)':
passport.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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