Submission #764115

#	Time	Username	Problem	Language	Result	Execution time	Memory
764115		dxz05	Radio Towers (IOI22_towers)	C++17	23 / 100	4091 ms	9036 KiB

towers

#pragma GCC optimize("Ofast,O3,unroll-loops")
#pragma GCC target("avx,avx2")

#include "towers.h"
#include <bits/stdc++.h>

using namespace std;

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

int calc(int l, int r, int h, int d){
    if (l > r) return 0;
    if (r - l + 1 <= 2) return a[l] <= h || a[r] <= h;

    int ans = 0;
    int m = l;
    for (int i = l; i <= r; i++){
        if (a[i] > a[m]) m = i;
        if (a[i] <= h) ans = 1;
    }

    ans = max(ans, calc(l, m - 1, a[m] - d, d) + calc(m + 1, r, a[m] - d, d));

    return ans;
}

int max_towers(int L, int R, int D) {
    return calc(L, R, 2e9, D);
}

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