Submission #1278687

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278687		phuocrucpp	Passport (JOI23_passport)	C++20	0 / 100	530 ms	69340 KiB

passport

/*ㅤ∧＿∧
　(　･∀･)
　(　つ┳⊃
ε (_)へ⌒ヽﾌ
 (　　(　･ω･)
 ◎―◎   ⊃  ⊃
BePhuongSuperSuwi
From TK4 - CHT
ㅤㅤ／ ⌒＼____
　 /・　　 ）　　\
　/ノへ ノ　　　 /|
ノ　　  ＼\ |/_/_/*/


#include<bits/stdc++.h>
#define task "main"
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
//#define int long long
#define pb push_back
#define fi first
#define se second
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii, ii>
#define base 341
#define MASK(i) (1ll << i)
#define oo 2e9
#define isOn(x,i) ((x) & MASK(i))
#define bitOn(x,i) ((x) | MASK(i))
#define bitOff(x,i) ((x) & ~MASK(i))
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define __lcm(a,b) (1ll * ((a) / __gcd((a), (b))) * (b))
using namespace std;
//using namespace __gnu_pbds;
const int maxn = 1e7 + 2;
int n, l[maxn], r[maxn];
vector <ii> nen, g[maxn];
int lim = 0;
int st[maxn];
void build(int id, int l, int r) {
    if (l == r) {
        st[l] = id;
        return;
    }

    int m = (l + r) / 2;
    build(id * 2, l, m);
    build(id * 2 + 1, m + 1, r);
    g[id * 2].pb({id, 0});
    g[id * 2 + 1].pb({id, 0});
}

void update(int id, int l, int r, int u, int v, int idx) {
    if (u > r || v < l) return;
    if (l >= u && r <= v) {
//        g[idx].pb({st[id], 1});
        g[id].pb({idx, 1});
        return;
    }
    int m = (l + r) / 2;
    update(id * 2, l, m, u, v, idx);
    update(id * 2 + 1, m + 1, r, u, v, idx);
}

int dist1[maxn], dist2[maxn];
void bfs(int st, int dist[]) {
    deque <int> q;
//    cout << lim << endl;
    for (int i = 1; i <= 4 * n; i++) dist[i] = oo;
    dist[st] = 0;
   // cout << st << " " << dist[st] << endl;

    q.push_back(st);

    while(!q.empty()) {
        int z = q.front();
        q.pop_front();

        for (auto e : g[z]) {
            int x = e.fi, y = e.se;
            if (dist[x] > dist[z] +  y) {
                dist[x] = dist[z] + y;
                if (y == 0) q.push_front(x);
                else q.push_back(x);
            }
        }
    }
}

int d[maxn];
void djk() {
    priority_queue <ii, vector <ii>, greater <ii>> q;
    for (int i = 1; i <= 4 * n; i++) d[i] = oo;
    for (int i = 1; i <= n; i++) {
        d[st[i]] = dist1[st[i]] + dist2[st[i]] - (i != 1 && i != n);
        q.push({d[st[i]], st[i]});

     //   cout << d[st[i]] << " " << st[i] << endl;
    }

    while(!q.empty()) {
        int cost = q.top().fi, z = q.top().se;
        q.pop();

        for (auto e : g[z]) {
            int x = e.fi, y = e.se;
            if (d[x] > d[z] + y) {
                d[x] = d[z] + y;
                q.push({d[x], x});
            }
        }
    }
}

main() {
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    if(fopen(task".inp","r")) {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> l[i] >> r[i];
    }
    build(1, 1, n);
//    cout << lim << endl;
    for (int i = 1; i <= n; i++) {
//        cout << l[i] << " " << r[i] << endl;
        update(1, 1, n, l[i], r[i], st[i]);
    }
    bfs(st[1], dist1);
    bfs(st[n], dist2);


    djk();
    int t = 1; cin >> t;
    while(t--) {
        int x; cin >> x;
        if (d[st[x]] >= n) cout << "-1" << endl;
        else cout << d[st[x]] << endl;
    }

}

Compilation message (stderr)

passport.cpp:117:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  117 | main() {
      | ^~~~
passport.cpp: In function 'int main()':
passport.cpp:120:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp:121:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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