Submission #555973

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
555973	2022-05-02 04:00:12	joelau	Rainforest Jumps (APIO21_jumps)	C++14	100 / 100	1170 ms	66104 KiB

jumps

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#include "jumps.h"
#include <bits/stdc++.h>
using namespace std;
int n, p1[200005][20], p2[200005][20], p3[200005][20], p4[200005][20], X[200005];
stack<int> s;
void init(int N, std::vector<int> H) {
    n = N;
    for (int i = 0; i < N; ++i) X[i] = H[i];
    memset(p1,-1,sizeof(p1));
    memset(p2,-1,sizeof(p2));
    memset(p3,-1,sizeof(p3));
    memset(p4,-1,sizeof(p4));
    for (int i = 0; i < N; ++i) {
        while (!s.empty() && H[i] >= H[s.top()]) s.pop();
        if (!s.empty()) p1[i][0] = p3[i][0] = s.top();
        s.push(i);
    }
    while (!s.empty()) s.pop();
    for (int i = N-1; i >= 0; --i) {
        while (!s.empty() && H[i] >= H[s.top()]) s.pop();
        if (!s.empty()) p2[i][0] = p4[i][0] = s.top();
        s.push(i);
    }
    for (int i = 0; i < N; ++i) if (p1[i][0] == -1 || (p1[i][0] != -1 && p2[i][0] != -1 && H[p1[i][0]] < H[p2[i][0]])) swap(p1[i][0], p2[i][0]);
    for (int k = 1; k < 20; ++k) for (int i = 0; i < N; ++i) {
        if (p1[i][k-1] == -1) p1[i][k] = -1;
        else p1[i][k] = p1[p1[i][k-1]][k-1];
        if (p2[i][k-1] == -1) p2[i][k] = -1;
 
 
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• Subtask 1: 4 / 4
• Subtask 2: 8 / 8
• Subtask 3: 13 / 13
• Subtask 4: 12 / 12
• Subtask 5: 23 / 23
• Subtask 6: 21 / 21
• Subtask 7: 19 / 19