Submission #737336

#	Time	Username	Problem	Language	Result	Execution time	Memory
737336		keisuke6	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	1 ms	336 KiB

jumps

#include "jumps.h"

#include <vector>
#include <queue>
using namespace std;
vector<vector<int>> G;
int n;
void init(int N, std::vector<int> H) {
  G.resize(N);
  int n = N;
  for(int i=0;i<N;i++){
    int now = i-1;
    while(now >= 0 && H[now] < H[i]) now--;
    if(now != -1) G[i].push_back(now);
    now = i+1;
    while(now < N && H[now] < H[i]) now++;
    if(now != N) G[i].push_back(now);
  }
  return;
}

int minimum_jumps(int A, int B, int C, int D) {
  vector<int> dist(n,1e9);
  queue<int> q;
  for(int i=A;i<=B;i++){
    dist[i] = 0;
    q.push(i);
  } 
  while(!q.empty()){
    int pos = q.front();
    q.pop();
    for(int x:G[pos]){
      if(dist[x] == 1e9) continue;
      dist[x] = dist[pos] + 1;
      q.push(x);
    }
  }
  int ans = 1e9;
  for(int i=C;i<=D;i++) ans = min(ans,dist[i]);
  return (ans == 1e9 ? -1 : ans);
}

Compilation message (stderr)

jumps.cpp: In function 'void init(int, std::vector<int>)':
jumps.cpp:10:7: warning: unused variable 'n' [-Wunused-variable]
   10 |   int n = N;
      |       ^

• 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