Submission #1311549

#	Time	Username	Problem	Language	Result	Execution time	Memory
1311549		madamadam3	Telefoni (COCI17_telefoni)	C++20	80 / 80	13 ms	3912 KiB

telefoni

#include <bits/stdc++.h>

using namespace std;

int main() {
    cin.tie(0)->sync_with_stdio(0);

    int n, d; cin >> n >> d;
    vector<int> a(n); for (int i = 0; i < n; i++) cin >> a[i];
    vector<int> f(n, INT_MAX), r(n, INT_MAX);
    f[0] = r[n-1] = 0;
    
    deque<int> window; window.push_back(0);
    for (int i = 0; i < n; i++) {
        while (abs(window.front() - i) > d) window.pop_front();
        f[i] = a[i] ? f[window.front()] : f[window.front()] + 1;

        while (!window.empty() && f[window.back()] > f[i]) window.pop_back();
        window.push_back(i);
    }

    window.assign(1, n-1);
    for (int i = n-1; i >= 0; i--) {
        while (abs(window.front() - i) > d) window.pop_front();
        r[i] = a[i] ? r[window.front()] : r[window.front()] + 1;

        while (!window.empty() && r[window.back()] > r[i]) window.pop_back();
        window.push_back(i);
    }

    int x = INT_MAX; for (int i = 0; i < n; i++) x = min(x, a[i] ? f[i] + r[i] : f[i] + r[i] - 1);
    cout << x << "\n";
    return 0;
}

• Subtask 1: 80 / 80