Submission #554336

#	Time	Username	Problem	Language	Result	Execution time	Memory
554336		ian2024	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	4054 ms	14920 KiB

jumps

#include <bits/stdc++.h>

using namespace std;
struct C_HASH {
  static uint64_t splitmix64(uint64_t x) {
    // http://xorshift.di.unimi.it/splitmix64.c
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }

  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM =
        chrono::steady_clock::now().time_since_epoch().count();
    return splitmix64(x + FIXED_RANDOM);
  }
};

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

typedef pair<int, int> ii;
typedef tuple<int, int, int> iii;
typedef long long ll;

const int INF = 1e9;
const ll INFL = 1e18;
const int MOD = 1000000007;

#define SIZE(a) (int)(a).size()
#define endl '\n'
#define all(x) x.begin(), x.end()
#define ALL(x) begin(x), end(x)

int l[200005];
int r[200005];

#ifdef LOCAL_PROJECT
void init(int N, std::vector<int> H);
int minimum_jumps(int A, int B, int C, int D);
int dfs(int a, int b);

signed 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);
  
  cerr << dfs(4, 6);

  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;
}
#else
#define cerr \
  if (false) cerr
#include "jumps.h"
#endif

void init(int N, std::vector<int> H) {
  fill(begin(l), end(l), -1);
  fill(begin(r), end(r), -1);
  
  set<int> s;
  vector<ii> v;
  for (int i = 0; i < N; ++i) {
    v.push_back({H[i], i});
  }
  sort(all(v), greater<ii>());
  for (int i = 0; i < N; ++i) {
    int height, idx;
    tie(height, idx) = v[i];
    s.insert(idx);
    auto it = s.lower_bound(idx);
    if (it != s.begin()) {
      it--;
      l[idx] = *it;
    }
    it = s.upper_bound(idx);
    if (it != s.end()) {
      r[idx] = *it;
    }
  }
}

int dfs(int u, int target) {
	if (u == target) {
		return 0;
	}
	if (u == -1) {
		return INF;
	}
	
	return 1 + min(dfs(l[u], target), dfs(r[u], target));
}

int minimum_jumps(int A, int B, int C, int D) { 
    int res = INF;
	for (int i = A; i <= B; ++i) {
		for (int j = C; j <= D; ++j) {
			res = min(res, dfs(i, j));
		}
	}
    if (res == INF) return -1;
    return res;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19