Submission #1254436

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254436		nvc2k8	Passport (JOI23_passport)	C++20	0 / 100	2096 ms	15692 KiB

passport

#include <bits/stdc++.h>
#define TASK "passport"
#define endl '\n'
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define BIT(i,x) (((i)>>(x))&1)
#define FOR(i,a,b) for(int i = (a); i<=(b); i++)
#define FORD(i,a,b) for(int i = (a); i>=(b); i--)
#define all(C) C.begin(), C.end()
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int INT_LIM = 2147483647;
const ll LL_LIM = 9223372036854775807;
template <typename X> bool minimize(X &x, const X &y) {if (x>y){x = y; return true;}return false;}
template <typename X> bool maximize(X &x, const X &y) {if (x<y){x = y; return true;}return false;}
///------------------------------------------///
struct SegmentTree{
    int leaf[200005];
    pii T[800005];
    void build(int id, int l, int r, pii val[200005])
    {
        if (l==r)
        {
            leaf[l] = id;
            T[id] = val[l];
            return;
        }
        int mid = (l+r)>>1;
        build(id*2, l, mid, val);
        build(id*2+1, mid+1, r, val);
        T[id].fi = min(T[id*2].fi, T[id*2+1].fi);
        T[id].se = max(T[id*2].se, T[id*2+1].se);
    }
    void update(int u)
    {
        T[leaf[u]] = mp(INT_LIM, -INT_LIM);
        for (int id = leaf[u]>>1; id>0; id>>=1)
        {
            T[id].fi = min(T[id*2].fi, T[id*2+1].fi);
            T[id].se = max(T[id*2].se, T[id*2+1].se);
        }
    }
    void walk(int id, int l, int r, int x, vector<int> &ret)
    {
        if (T[id].fi>x || T[id].se<x) return;
        if (l==r)
        {
            ret.pb(l);
            return;
        }
        int mid = (l+r)>>1;
        walk(id*2, l, mid, x, ret);
        walk(id*2+1, mid+1, r, x, ret);
    }
} tree;

int n,q;
pii a[200005];
int dist[2][200005];
int f[200005];

void inp()
{
    cin >> n;
    FOR(i, 1, n) cin >> a[i].fi >> a[i].se;
    cin >> q;
}

void dijkstra(int source, int dist[200005])
{
    tree.build(1, 1, n, a);
    priority_queue<pii, vector<pii>, greater<pii> > q;

    if (source)
    {
        FOR(i, 1, n) dist[i] = INT_LIM;
        dist[source] = 0; q.push(mp(0, source));
    }
    else
    {
        FOR(i, 1, n) q.push(mp(dist[i], i));
    }

    while (!q.empty())
    {
        int u = q.top().se, d = q.top().fi;
        q.pop();
        if (dist[u]<d || d==INT_LIM) continue;
        vector<int> adj;
        tree.walk(1, 1, n, u, adj);
        for (auto v:adj) if (minimize(dist[v], d+1))
        {
            tree.update(v);
            q.push(mp(d+1, v));
        }
    }
}

void solve()
{
    dijkstra(1, dist[0]);
    dijkstra(n, dist[1]);
    FOR(i, 1, n)
    {
        if (dist[0][i]!=INT_LIM && dist[1][i]!=INT_LIM)
        {
            f[i] = dist[0][i]+dist[1][i];
            if (min(dist[0][i], dist[1][i])==1) f[i]--;
        }
        else f[i] = INT_LIM;
    }
    dijkstra(0, f);

    FOR(i, 1, q)
    {
        int x;
        cin >> x;
        if (f[x]==INT_LIM) cout << -1 << endl;
        else cout << f[x] << endl;
    }
}

signed main()
{
    ///--------------------------///
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen(TASK".INP","r")!=NULL)
    {
        freopen(TASK".INP","r",stdin);
        freopen(TASK".OUT","w",stdout);
    }
    ///--------------------------///

    int NTEST = 1;
    bool codeforces = 0;
    if (codeforces) cin >> NTEST;

    while (NTEST--)
    {
        inp();
        solve();
    }

    return 0;
}

///------------------------------------------///

Compilation message (stderr)

passport.cpp: In function 'int main()':
passport.cpp:132:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  132 |         freopen(TASK".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
passport.cpp:133:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  133 |         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