제출 #824242

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
824242		Liudas	Radio Towers (IOI22_towers)	C++17	0 / 100	4072 ms	27972 KiB

towers

#include "towers.h"

#include <cassert>
#include <cstdio>

#include <bits/stdc++.h>
using namespace std;
vector<int> H;
int N;
void init(int n, vector<int> h){
    H = h;
    N = n;
}
void dfs(int head, vector<bool> &vis, vector<bitset<2000>> &tree, int c, int &S, bitset<2000> can){
    vis[head] = true;
    can &= tree[head];
    for(int i = 0; i < N; i ++){
        if(!vis[i] && can[i]){
            dfs(i, vis, tree, c + 1, S, can);
        }
    }
    vis[head] = false;
    S = max(S, c);
}
int max_towers(int L, int R, int D){
    vector<bitset<2000>> tree(N);
    for(int i = L; i <= R; i ++){
        int maxi = H[i];
        tree[i][i] = 1;
        for(int j = i; j <= R; j ++){
            if(H[i] + D <= maxi && H[j] + D <= maxi){
                tree[i][j] = 1;
                tree[j][i] = 1;
            }
            maxi = max(maxi, H[j]);
        }
    }
    int S = 0;
    for(int i = L; i <= R; i ++){
        vector<bool> vis(N);
        bitset<2000> can = tree[i];
        dfs(i, vis, tree, 1, S, can);
    }
    return S;
}

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