Submission #440482

#	Time	Username	Problem	Language	Result	Execution time	Memory
440482		sam571128	Rainforest Jumps (APIO21_jumps)	C++14	12 / 100	869 ms	3240 KiB

jumps

#include "jumps.h"

#include <bits/stdc++.h>

using namespace std;

bool sub1 = true;
int adj[205][205];

void init(int N, std::vector<int> H) {
    for(int i = 0;i < N-1;i++){
        if(H[i+1]!=H[i]+1) sub1 = false;
    }

    if(sub1) return;

    for(int i = 0;i < N;i++){
        for(int j = 0;j < N;j++){
            adj[i][j] = 1e9;
        }
        adj[i][i] = 0;
    }

    for(int i = 0;i < N;i++){
        for(int j = i-1;~j;j--){
            if(H[j]>H[i]){
                adj[i][j] = 1;
                break;
            }
        }
        for(int j = i+1;j < N;j++){
            if(H[j]>H[i]){
                adj[i][j] = 1;
                break;
            }
        }
    }

    for(int k = 0;k < N;k++){
        for(int i = 0;i < N;i++){
            for(int j = 0;j < N;j++){
                adj[i][j] = min(adj[i][k]+adj[k][j],adj[i][j]);
            }
        }
    }

}

int minimum_jumps(int A, int B, int C, int D) {
    if(sub1) return min({abs(A-D),abs(A-C),abs(B-C),abs(B-D)});
    int ans = 1e9;
    for(int i = A;i <= B;i++){
        for(int j = C;j <= D;j++){
            ans = min(adj[i][j],ans);
        }
    }
    return (ans==1e9 ? -1 : ans);
}


//Subtask 2 => run floyd once

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