Submission #1083820

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083820		SamueleVid	Radio Towers (IOI22_towers)	C++17	4 / 100	688 ms	1368 KiB

towers

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

constexpr int MAXN = 1e5;
constexpr int PW = 131072;
vector<int> H;
int k;

void init(int N, vector<int> H) {
    :: H = H;

    k = 0;
    for (int i = 0; i < N - 1; i ++) {
        if (H[i] < H[i + 1]) k = i + 1;
    }
}

int max_towers(int L, int R, int D) {
    if (L >= k || R <= k) return 1;

    int dx = k - 1;
    for (int p = PW; p >= 1; p /= 2) {
        if (p + dx <= R && H[p + dx] > H[k] - D) dx += p;
    }
    dx ++;

    int sx = k + 1;
    for (int p = PW; p >= 1; p /= 2) {
        if (sx - p >= L && H[sx - p] > H[k] - D) sx -= p;
    }
    sx --;

    if (sx >= L && dx <= R) return 2;
    return 1;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 11
• Subtask 3: 0 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 17
• Subtask 6: 0 / 19
• Subtask 7: 0 / 23