oj.uz

Submission #467744

# Submission time Handle Problem Language Result Execution time Memory
467744 2021-08-24T09:48:58 Z spike1236 Rainforest Jumps (APIO21_jumps) C++14
0 / 100
 1 ms 328 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define ll long long
#define ld long double
#define all(_v) _v.begin(), _v.end()
#define sz(_v) (int)_v.size()
#define pii pair <int, int>
#define pll pair <ll, ll>
#define veci vector <int>
#define vecll vector <ll>

const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, -1, 1};
const double PI = 3.1415926535897932384626433832795;
const double eps = 1e-9;
const int MOD1 = 1e9 + 7;
const int MOD2 = 998244353;

const int MAXN = 2e5 + 10;
int a[MAXN];
int L[MAXN], R[MAXN];
int n;
bool issorted;
int up_L[MAXN][22], up_R[MAXN][22], up_h[MAXN][22];
int dist[MAXN];

void init(int _n, veci _a) {
    n = _n;
    for(int i = 0; i < _n; ++i) a[i + 1] = _a[i];
    issorted = 1;
    for(int i = 1; i <= n; ++i)
        issorted &= (a[i] == 1 + a[i - 1]);
    stack <int> st;
    for(int i = 1; i <= n; ++i) {
        while(!st.empty() && a[st.top()] < a[i]) st.pop();
        if(!st.empty()) L[i] = st.top();
        else L[i] = i;
        st.push(i);
    }
    while(!st.empty()) st.pop();
    for(int i = n; i > 0; --i) {
        while(!st.empty() && a[st.top()] < a[i]) st.pop();
        if(!st.empty()) R[i] = st.top();
        else R[i] = i;
        st.push(i);
    }
    for(int i = 1; i <= n; ++i) {
        up_L[i][0] = L[i];
        up_R[i][0] = R[i];
        up_h[i][0] = (a[L[i]] > a[R[i]] ? L[i] : R[i]);
    }
    for(int j = 1; j < 20; ++j) {
        for(int i = 1; i <= n; ++i) {
            up_L[i][j] = up_L[up_L[i][j - 1]][j - 1];
            up_R[i][j] = up_R[up_R[i][j - 1]][j - 1];
            up_h[i][j] = up_h[up_h[i][j - 1]][j - 1];
        }
    }
}

int minimum_jumps(int l, int r, int x, int y) {
    ++l, ++r, ++x, ++y;
    if(issorted) return y - x;
    if(l == r && x == y) {
        int ans = 0;
        for(int i = 19; i >= 0; --i)
            if(a[up_h[l][i]] <= a[x]) l = up_h[l][i], ans += (1 << i);
        if(a[L[l]] > a[y]) {
            for(int i = 19; i >= 0; --i)
                if(a[up_R[l][i]] <= a[x]) l = up_R[l][i], ans += (1 << i);
        } else {
            for(int i = 19; i <= 0; --i)
                if(a[up_L[l][i]] <= a[x]) l = up_L[l][i], ans += (1 << i);
        }
        return (l == x ? ans : -1);
    }
    queue <int> q;
    for(int i = 1; i <= n; ++i) dist[i] = 1e9;
    for(int i = l; i <= r; ++i) {
        q.push(i);
        dist[i] = 0;
    }
    while(!q.empty()) {
        int v = q.front();
        q.pop();
        if(dist[L[v]] > dist[v] + 1) {
            dist[L[v]] = dist[v] + 1;
            q.push(L[v]);
        }
        if(dist[R[v]] > dist[v] + 1) {
            dist[R[v]] = dist[v] + 1;
            q.push(R[v]);
        }
    }
    int ans = 1e9;
    for(int i = x; i <= y; ++i) ans = min(ans, dist[i]);
    return (ans == 1e9 ? -1 : ans);
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 276 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 276 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 328 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 328 KB Output isn't correct
2 Halted 0 ms 0 KB -