oj.uz

Submission #873106

# Submission time Handle Problem Language Result Execution time Memory
873106 2023-11-14T13:11:26 Z boris_mihov Passport (JOI23_passport) C++17
0 / 100
 356 ms 569980 KB 
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <vector>
#include <queue>

typedef long long llong;
const int MAXN = 200000 + 10;
const int INF = 1e9;

int n;
std::vector <std::pair <int,int>> g[MAXN];
struct SegmentTree
{
    int cnt;
    int tree[4*MAXN];

    void build(int l, int r, int node)
    {
        if (l == r)
        {
            tree[node] = l;
            return;
        }

        tree[node] = ++cnt;
        int mid = (l + r) / 2;
        build(l, mid, 2*node);
        build(mid + 1, r, 2*node + 1);
        g[tree[2 * node]].push_back({tree[node], 0});
        g[tree[2 * node + 1]].push_back({tree[node], 0});
    }

    void addEdges(int l, int r, int node, int queryL, int queryR, int queryNode)
    {
        if (queryL <= l && r <= queryR)
        {
            g[tree[node]].push_back({queryNode, 1});
            return;
        }

        int mid = (l + r) / 2;
        if (queryL <= mid) addEdges(l, mid, 2*node, queryL, queryR, queryNode);
        if (mid + 1 <= queryR) addEdges(mid + 1, r, 2*node + 1, queryL, queryR, queryNode);
    }

    void build()
    {
        cnt = n;
        build(1, n, 1);
    }

    void addEdges(int to, int l, int r)
    {
        addEdges(1, n, 1, l, r, to);
    }
};

int queries;
int l[MAXN];
int r[MAXN];
int dist[2 * MAXN];
int distA[2 * MAXN];
int distB[2 * MAXN];
std::queue <int> q[2 * MAXN];
std::deque <int> dq;
SegmentTree tree;
bool vis[MAXN];

void solve()
{
    tree.build();
    for (int i = 1 ; i <= n ; ++i)
    {
        tree.addEdges(i, l[i], r[i]);
    }   

    std::fill(distA + 1, distA + 1 + tree.cnt, INF);
    std::fill(distB + 1, distB + 1 + tree.cnt, INF);
    dq.push_back(1);
    distA[1] = 0;

    while (!dq.empty())
    {
        int top = dq.front();
        dq.pop_front();

        for (const auto &[u, d] : g[top])
        {
            if (distA[u] > distA[top] + d)
            {
                distA[u] = distA[top] + d;
                if (d == 0) dq.push_front(u);
                else dq.push_back(u);
            }
        }   
    }

    dq.push_back(n);
    distB[n] = 0;

    while (!dq.empty())
    {
        int top = dq.front();
        dq.pop_front();

        for (const auto &[u, d] : g[top])
        {
            if (distB[u] > distB[top] + d)
            {
                distB[u] = distB[top] + d;
                if (d == 0) dq.push_front(u);
                else dq.push_back(u);
            }
        }   
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        dist[i] = distA[i] + distB[i] - (distA[i] > 0 && distB[i] > 0);
        if (dist[i] <= 2 * n) q[dist[i]].push(i);
    }

    for (int d = 0 ; d <= n ; ++d)
    {
        while (!q[d].empty())
        {
            int top = q[d].front();
            q[d].pop();

            if (vis[top])
            {
                continue;
            }

            vis[top] = true;
            for (const auto &[u, d] : g[top])
            {
                if (dist[u] > dist[top] + d)
                {
                    dist[u] = dist[top] + d;
                    q[dist[u]].push(u);
                }
            }
        }
    }

    for (int i = 1 ; i <= queries ; ++i)
    {
        int node;
        std::cin >> node;
        if (dist[node] <= n) std::cout << dist[node] << '\n';
        else std::cout << -1 << '\n';
    }
}

void input()
{
    std::cin >> n;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> l[i] >> r[i];
    }

    std::cin >> queries;
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 283728 KB Output is correct
2 Correct 127 ms 283728 KB Output is correct
3 Correct 129 ms 283624 KB Output is correct
4 Runtime error 356 ms 569980 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 283728 KB Output is correct
2 Correct 131 ms 283804 KB Output is correct
3 Correct 132 ms 283812 KB Output is correct
4 Correct 136 ms 283816 KB Output is correct
5 Correct 148 ms 283984 KB Output is correct
6 Correct 129 ms 283632 KB Output is correct
7 Correct 128 ms 283728 KB Output is correct
8 Incorrect 128 ms 283728 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 283728 KB Output is correct
2 Correct 131 ms 283804 KB Output is correct
3 Correct 132 ms 283812 KB Output is correct
4 Correct 136 ms 283816 KB Output is correct
5 Correct 148 ms 283984 KB Output is correct
6 Correct 129 ms 283632 KB Output is correct
7 Correct 128 ms 283728 KB Output is correct
8 Incorrect 128 ms 283728 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #4
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 283728 KB Output is correct
2 Correct 131 ms 283804 KB Output is correct
3 Correct 132 ms 283812 KB Output is correct
4 Correct 136 ms 283816 KB Output is correct
5 Correct 148 ms 283984 KB Output is correct
6 Correct 129 ms 283632 KB Output is correct
7 Correct 128 ms 283728 KB Output is correct
8 Incorrect 128 ms 283728 KB Output isn't correct
9 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 134 ms 283728 KB Output is correct
2 Correct 127 ms 283728 KB Output is correct
3 Correct 129 ms 283624 KB Output is correct
4 Runtime error 356 ms 569980 KB Execution killed with signal 6
5 Halted 0 ms 0 KB -