Submission #554072

#	Time	Username	Problem	Language	Result	Execution time	Memory
554072		Zhora_004	Rainforest Jumps (APIO21_jumps)	C++17	Compilation error	0 ms	0 KiB

jumps

#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <unordered_set>
#include <queue>
#include <deque>
#include <string>
#include <sstream>
#include <iomanip>
#include <map>
#include <unordered_map>
#include <stack>
#include <cstdio>
#include <climits>
#include <tuple>
#include <ctime>
#include <cstring>
#include <numeric>
#include <functional>
#include <chrono>
#include <cassert>
#include <bitset>
#include <fstream>
//#include <bit>
//#include <ranges>
//#include <numbers>
#define sz(a) ((int)((a).size()))
// printf("%.10f\n", ans);
/*ofstream fout("timeline.out");
ifstream fin("timeline.in");*/
using ll = long long;
using namespace std;
const ll mod = 998244353;
const int N = 2e5 + 5, inf = 1e9;
int n, q, a, b, c, d, ans;
vector<int> h, dp, nge, pge, ind;
vector<vector<int>> go1, go2;

void NGE()
{
    stack<int> s;
    s.push(0);
    for (int i = 1; i < n; i++)
    {
        if (s.empty())
        {
            s.push(i);
            continue;
        }
        while (!s.empty() && h[s.top()] < h[i])
        {
            nge[s.top()] = i;
            s.pop();
        }
        s.push(i);
    }
    while (!s.empty())
    {
        nge[s.top()] = -1;
        s.pop();
    }
}

void PGE()
{
    stack<int> s;
    s.push(0);
    pge[0] = -1;
    for (int i = 1; i < n; i++)
    {
        while (!s.empty() && h[s.top()] < h[i]) s.pop();
        if (s.empty()) pge[i] = -1;
        else pge[i] = s.top();
        s.push(i);
    }
}

int dfs(int u)
{
    if (dp[u] != inf + 1) return dp[u];
    if (c <= u && u <= d) return dp[u] = 0;
    int r = nge[u];
    int ans = inf;
    if (r != -1) ans = min(ans, dfs(r) + 1);
    int l = pge[u];
    if (l != -1) ans = min(ans, dfs(l) + 1);
    return dp[u] = ans;
}

void solve()
{
    /*dp = vector<int>(n, inf + 1);
    ans = inf;
    for (int i = a; i <= b; i++) ans = min(ans, dfs(i));
    if (ans == inf) ans = -1;
    cout << ans << "\n";*/
    if (h[a] > h[c])
    {
        cout << "-1\n";
        return;
    }
    int ans = 0, id = a;
    for (int i = 19; i >= 0; i--)
    {
        int u = go1[id][i];
        if (u < n && h[u] <= h[c])
        {
            ans += (1 << i);
            id = u;
        }
    }
    for (int i = 19; i >= 0; i--)
    {
        int u = go2[id][i];
        if (u < n && h[u] <= h[c])
        {
            ans += (1 << i);
            id = u;
        }
    }
    if (id == c) cout << ans << "\n";
    else cout << "-1\n";
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> q;
    h = nge = pge = vector<int>(n);
    ind = vector<int>(n + 1);
    go1 = go2 = vector<vector<int>>(n, vector<int>(20));
    for (int i = 0; i < n; i++) cin >> h[i];
    NGE();
    PGE();
    for (int i = 0; i < n; i++) ind[h[i]] = i;
    for (int i = n; i >= 1; i--)
    {
        int id = ind[i];
        int l = pge[id], r = nge[id];
        if (l == -1 || r == -1) go1[id][0] = n;
        else
        {
            if (h[l] > h[r]) go1[id][0] = l;
            else go1[id][0] = r;
        }
        for (int j = 1; j < 20; j++)
        {
            int u = go1[id][j - 1];
            if (u == n) go1[id][j] = n;
            else go1[id][j] = go1[u][j - 1];
        }
        if (l == -1 && r == -1) go2[id][0] = n;
        else if (l == -1) go2[id][0] = r;
        else if (r == -1) go2[id][0] = l;
        else
        {
            if (h[l] < h[r]) go2[id][0] = l;
            else go2[id][0] = r;
        }
        for (int j = 1; j < 20; j++)
        {
            int u = go2[id][j - 1];
            if (u == n) go2[id][j] = n;
            else go2[id][j] = go2[u][j - 1];
        }
    }
    while (q--)
    {
        cin >> a >> b >> c >> d;
        solve();
    }

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/cc0zU3Hg.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccVr6nai.o:jumps.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc0zU3Hg.o: in function `main':
stub.cpp:(.text.startup+0x177): undefined reference to `init(int, std::vector<int, std::allocator<int> >)'
/usr/bin/ld: stub.cpp:(.text.startup+0x1d1): undefined reference to `minimum_jumps(int, int, int, int)'
collect2: error: ld returned 1 exit status