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Submission #836791

# Submission time Handle Problem Language Result Execution time Memory
836791 2023-08-24T15:46:29 Z tengiz05 Radio Towers (IOI22_towers) C++17
0 / 100
 1342 ms 2616 KB 
#include "towers.h"

#include <bits/stdc++.h>
using namespace std;

vector<int> h;
vector<int> incers;
int n;
void init(int N, vector<int> H) {
    n = N;
    h = H;
    for (int i = 0; i < n - 1; i++) {
        if (h[i] < h[i + 1]) {
            incers.push_back(i);
        }
    }
    incers.push_back(n);
}

bool processed = false;
vector<int> nxt, dow;
int max_towers(int l, int r, int D) {
    if (!processed) {
        processed = true;
        deque<pair<int, int>> st;
        nxt.assign(n + 1, n);
        dow.assign(n + 1, n);
        for (int i = n - 1; i >= 0; i--) {
            while (!st.empty() && h[st.front().second] <= h[i]) st.pop_front();
            st.push_front({h[i], i});
            auto p = lower_bound(st.begin(), st.end(), pair{h[i] + D, -1});
            if (p != st.end()) {
                nxt[i] = p->second;
            }
        }
        for (int i = n - 2; i >= 0; i--) {
            nxt[i] = min(nxt[i], nxt[i + 1]);
        }
        st.clear();
        for (int i = n - 1; i >= 0; i--) {
            while (!st.empty() && h[st.front().second] >= h[i]) st.pop_back();
            st.push_back({h[i], i});
            auto p = lower_bound(st.begin(), st.end(), pair{h[i] - D + 1, -1});
            if (p != st.begin()) {
                p--;
                dow[i] = p->second;
            }
        }
        for (int i = n - 2; i >= 0; i--) {
            dow[i] = min(dow[i], dow[i + 1]);
        }
    }
    // for (int i = 0; i < n; i++) {
        // cout << nxt[i] << " " << dow[i] << "\n";
    // }
    int p = *lower_bound(incers.begin(), incers.end(), l);
    int s = 0;
    while (p < r) {
        if (s % 2 == 0) {
            p = nxt[p];
            if (p <= r) {
                s++;
            }
        } else {
            p = dow[p];
            if (p <= r) {
                s++;
            }
        }
    }
    return s / 2 + 1;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 349 ms 1844 KB 31st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '13', found: '8'
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '13', found: '8'
2 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 1342 ms 2616 KB 1st lines differ - on the 1st token, expected: '11903', found: '2493'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 386 ms 720 KB 1st lines differ - on the 1st token, expected: '7197', found: '1033'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '13', found: '8'
2 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 349 ms 1844 KB 31st lines differ - on the 1st token, expected: '1', found: '2'
2 Halted 0 ms 0 KB -