Submission #718686

#	Time	Username	Problem	Language	Result	Execution time	Memory
718686		lam	Rainforest Jumps (APIO21_jumps)	C++14	Compilation error	0 ms	0 KiB

jumps

#include "jumps.h"

#include <cassert>
#include <cstdio>

#include <vector>
#include "jumps.h"
#include <bits/stdc++.h>
#include <vector>
using namespace std;
const int maxn = 2e5 + 10;
int n;
int a[maxn],b[maxn],d[maxn];
vector <int> adj[maxn];
int par[20][maxn];
int f[20][maxn],g[20][maxn];
void create()
{
    for (int i=0; i<n; i++) f[0][i] = b[i];
    for (int j=1; (1<<j)<=n; j++)
        for (int i=0; i+(1<<j)-1<n; i++)
            f[j][i] = max(f[j-1][i],f[j-1][i+(1<<(j-1))]);
}

int get(int l, int r)
{
    if (l>r) return -1;
    int k=log2(r-l+1);
    return max(f[k][l],f[k][r-(1<<k)+1]);
}

void addedge(int u, int v)
{
    adj[u].push_back(v);
}
void init(int N, std::vector<int> H) {
    n=N;
    for (int i=0; i<n; i++) a[i]=H[i],adj[i].clear();
    deque<int> dq;
    for (int i=n-1; i>=0; i--)
    {
        while (!dq.empty()&&a[dq.back()] < a[i]) dq.pop_back();
        if (!dq.empty()) b[i] = dq.back(), d[i]=d[dq.back()]+1;
        else b[i] = -1,d[i]=0;
        dq.push_back(i);
    }
    while (!dq.empty()) dq.pop_back();
    for (int i=0; i<n; i++)
    {
        while (!dq.empty()&&a[dq.back()] < a[i]) dq.pop_back();
        if (!dq.empty()) par[0][i] = dq.back(), g[0][i] = d[i];
        else par[0][i]=-1, g[0][i] = -1e9;
        dq.push_back(i);
    }
    create();
    for (int i=0; i<n; i++)
        for (int j=1; j<20; j++)
            if (par[j-1][i]==-1) par[j][i]=-1,g[j][i] = -1e9;
            else
            {
                par[j][i]=par[j-1][par[j-1][i]];
                g[j][i] = max(g[j-1][i],g[j-1][par[j-1][i]]);
            }
}

int minimum_jumps(int A, int B, int C, int D) {
    if (A==C) return 0;
    if (a[A] > a[C]) return -1;
    int smx = get(B+1,C-1);
    if (smx > a[C]) return -1;
    int ans = 1e9;
    if (smx < a[C])
        ans = d[A] - d[C];
    int u=A;
    for (int i=19; i>=0; i--)
        if (par[i][u]!=-1&&a[par[i][u]] < a[C])
        {
            ans = min(ans,g[i][u]-d[C]);
            u=par[i][u];
        }
    return ans;

}


int main() {
  int N, Q;
  assert(2 == scanf("%d %d", &N, &Q));
  std::vector<int> H(N);
  for (int i = 0; i < N; ++i) {
    assert(1 == scanf("%d", &H[i]));
  }
  init(N, H);

  for (int i = 0; i < Q; ++i) {
    int A, B, C, D;
    assert(4 == scanf("%d %d %d %d", &A, &B, &C, &D));
    printf("%d\n", minimum_jumps(A, B, C, D));
  }
  return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccemYm0O.o: in function `main':
stub.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccou44uQ.o:jumps.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status