Submission #980730

#	Time	Username	Problem	Language	Result	Execution time	Memory
980730		vjudge1	Rainforest Jumps (APIO21_jumps)	C++17	Compilation error	0 ms	0 KiB

jumps

#include "jumps.h"
#include<bits/stdc++.h>
#define sz size()
#define ll int
using namespace std;
const ll INF = 1e9;
const ll NN = 300300;

ll up[NN][21], dw[NN][21];
int n, ok = 1;
vector<vector<ll>> v;
vector<ll> h;
void init(int N, vector<int> H)
{
    n = N;
    h = H;
    v.resize(n);
    vector<ll> q;
    for(ll i = 0; i < n; ++i)
        up[i][0] = -1,
                   dw[i][0] = -1;
    for(ll i = 0; i < n; ++i)
    {
        ok &= h[i] == i + 1;
        while(q.sz && h[q.back()] < h[i])
            v[q.back()].push_back(i),
            up[q.back()][0] = i,
                              q.pop_back();
        q.push_back(i);
    }
    q.clear();
    for(ll i = n - 1; i >= 0; --i)
    {
        while(q.sz && h[q.back()] < h[i])
            v[q.back()].push_back(i),
            dw[q.back()][0] = i,
                              q.pop_back();
        q.push_back(i);
    }
    for(ll i = 0; i < n; ++i)
        if(dw[i][0] > up[i][0]) swap(up[i][0], dw[i][0]);
    for(ll i = 0; i < n; ++i)
        if(dw[i][0] < 0) swap(up[i][0], dw[i][0]);
    for(ll j = 1; j < 21; ++j)
        for(ll i = 0; i < n; ++i)
        {
            if(up[i][j - 1] == -1) up[i][j] = -1;else
            up[i][j] = up[up[i][j - 1]][j - 1];
            if(qw[i][j - 1] == -1) qw[i][j] = -1;else
            dw[i][j] = dw[dw[i][j - 1]][j - 1];
        }
}

int minimum_jumps(int a, int b, int c, int d)
{
    if(ok) return c - b;
    if(a == b && c == d)
    {
        ll ans = 0;
        for(ll j = 20; j >= 0; --j)
        {
            if(up[a][j] < 0) continue;
            if(h[up[a][j]] <= h[d])
                a = up[a][j], ans += (1 << j);
        }
        for(ll j = 20; j >= 0; --j)
        {
            if(dw[a][j] < 0) continue;
            if(h[dw[a][j]] <= h[d])
                a = dw[a][j], ans += (1 << j);
        }
        return a == d ? ans : -1;
    }
    vector<ll> dist(n, INF);
    queue<ll> q;
    for(ll i = a; i <= b; ++i)
    {
        dist[i] = 0;
        q.push(i);
    }
    while(q.sz)
    {
        ll s = q.front();
        q.pop();
        for(ll t : v[s])
        {
            if(dist[t] < INF) continue;
            dist[t] = dist[s] + 1;
            q.push(t);
        }
    }
    ll ans = INF;
    for(ll i = c; i <= d; ++i)
        ans = min(ans, dist[i]);
    return ans < INF ? ans : -1;
}

//signed main()
//{
//    ios_base::sync_with_stdio(0);
//    cin.tie(0), cout.tie(0);
//}

Compilation message (stderr)

jumps.cpp: In function 'void init(int, std::vector<int>)':
jumps.cpp:49:16: error: 'qw' was not declared in this scope; did you mean 'q'?
   49 |             if(qw[i][j - 1] == -1) qw[i][j] = -1;else
      |                ^~
      |                q