Submission #428958

#	Time	Username	Problem	Language	Result	Execution time	Memory
428958		Keshi	Comparing Plants (IOI20_plants)	C++17	0 / 100	1 ms	204 KiB

plants

//In the name of God
#include <bits/stdc++.h>
#include "plants.h"
using namespace std;

typedef int ll;
typedef pair<ll, ll> pll;

const ll maxn = 2e5 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e9;

#define fast_io ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define Mp make_pair
#define F first
#define S second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define Sz(x) ll((x).size())
#define lc (id << 1)
#define rc (lc | 1)

ll n, k, a[maxn], b[maxn], l[maxn], r[maxn];

inline ll dis(ll i, ll j){
	if(i <= j) return j - i;
	return j - i + n;
}
inline ll val(ll i){
	return (i % n + n) % n;
}

bool ok(ll i, ll j, ll k){
	return dis(i, j) + dis(j, k) == dis(i, k);
}

void init(int K, vector<int> R){
	k = K;
	n = Sz(R);
	ll yek = -1;
	for(ll i = 0; i < n; i++){
		a[i] = R[i];
		if(a[i]) yek = i;
	}
	assert(~yek);
	ll i = yek;
	do{
		if(a[i] == 0) r[i] = r[val(i + 1)];
		else r[i] = i;
		i = val(i - 1);
	}while(i != yek);
	do{
		if(a[val(i - 1)] == 1) l[i] = l[val(i - 1)];
		else l[i] = i;
		i = val(i + 1);
	}while(i != yek);
	return;
}

int compare_plants(int x, int y){
	if(ok(l[x], y, r[x])) return 1;
	if(ok(l[y], x, r[y])) return -1;
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 14
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25