제출 #1239034

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1239034		a4n_	Radio Towers (IOI22_towers)	C++20	23 / 100	4033 ms	23200 KiB

towers

#include <bits/stdc++.h>
#include "towers.h"
 
using namespace std;
 
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
#define F first
#define S second
#define endl '\n'
#define Mp make_pair
#define pb push_back
#define pf push_front
#define size(x) (ll)x.size()
#define all(x) x.begin(), x.end()
#define fuck(x) cout<<"("<<#x<<" : "<<x<<")\n"
 
const int N = 3e5 + 100, lg = 18;
const ll Mod = 1e9 + 7;
const ll inf = 1e18 + 10;
 
ll MOD(ll a, ll mod=Mod) {
    a%=mod; (a<0)&&(a+=mod); return a;
}
ll poww(ll a, ll b, ll mod=Mod) {
    ll res = 1;
    while(b > 0) {
        if(b%2 == 1) res = MOD(res * a, mod);
        b /= 2;
        a = MOD(a * a, mod);
    }
    return res;
}
 
int t, n, h[N], pr[N], par[lg][N], par2[lg][N];

void init(int _N, vector<int> _H) {
    n = _N;
    for(int i=1; i<=n; i++) {
        h[i] = _H[i - 1];
    }

    for(int i=n; i>=1; i--) {
        par[0][i] = i;
        par2[0][i] = i;
        for(int j=1; j<lg; j++) {
            int x = par[j-1][i], y = par[j-1][min(n, i+(1<<(j-1)))];
            par[j][i] = (h[x] > h[y] ? x : y);
            x = par2[j-1][i], y = par2[j-1][min(n, i+(1<<(j-1)))];
            par2[j][i] = (h[x] < h[y] ? x : y);
        }
    }
}

int getmx(int l, int r) {
    int res = l;
    for(int i=lg-1; i>=0; i--) {
        if(l + (1<<i) <= r + 1) {
            res = (h[res] > h[par[i][l]] ? res : par[i][l]);
            l += (1<<i);
        }
    }
    return res;
}

int getmn(int l, int r) {
    int res = l;
    for(int i=lg-1; i>=0; i--) {
        if(l + (1<<i) <= r + 1) {
            res = (h[res] < h[par2[i][l]] ? res : par2[i][l]);
            l += (1<<i);
        }
    }
    return res;
}

int divide(int l, int r, int mx, int d) {
    if(l > r) return 0;

    int mini = getmn(l, r);
    int maxi = getmx(l, r);

    int ldp = divide(l, maxi - 1, h[maxi] - d, d), rdp = divide(maxi + 1, r, h[maxi] - d, d);

    return max(ldp + rdp, (int)(h[mini] <= mx));
}

int max_towers(int l, int r, int d) {
    l++, r++;
    if(r == l) return 1;
    return divide(l, r, 1e9, 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