Submission #117614

#	Time	Username	Problem	Language	Result	Execution time	Memory
117614		RockyB	Aliens (IOI07_aliens)	C++17	100 / 100	5 ms	384 KiB

aliens

/// In The Name Of God

#include <bits/stdc++.h>

#define int long long

#define f first
#define s second

#define pb push_back
#define pp pop_back
#define mp make_pair

#define sz(x) (int)x.size()
#define sqr(x) ((x) * 1ll * (x))
#define all(x) x.begin(), x.end()

#define rep(i, l, r) for (int i = (l); i <= (r); i++)
#define per(i, l, r) for (int i = (l); i >= (r); i--)

#define Kazakhstan ios_base :: sync_with_stdio(0), cin.tie(0), cout.tie(0);

#define nl '\n'
#define ioi exit(0);

typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;

const int N = (int)5e5 + 7;
const int inf = (int)1e9 + 7;
const int mod = (int)1e9 + 7;
const ll linf = (ll)1e18 + 7;

const int dx[] = {-1, 0, 1, 0, 1, -1, -1, 1};
const int dy[] = {0, 1, 0, -1, 1, -1, 1, -1};

using namespace std;


namespace checker {
	int n, X, Y, m;

	void init(int _n, int _X, int _Y, int _m) {
		n = _n, X = _X, Y = _Y, m = _m;
	}
	bool check(ll x, ll y) {
		if (x < X || y < Y) return 0;
		x = x - X + 1;
		y = y - Y + 1;
		x = (x + m - 1) / m;
		y = (y + m - 1) / m;
		return x % 2 == y % 2 && x <= 5 && y <= 5;
	}
}

ll n;
ll cnt;


bool check(ll x, ll y) {
	return 1 <= x && x <= n && 1 <= y && y <= n;
}
ll ask(ll x, ll y) {
	if (!check(x, y)) return 0;
	
	#ifndef IOI2018
	{ // --- mine stuf
		++cnt;
		assert(cnt <= 300);
	}

	cout << "examine " << x << ' ' << y << endl;
	string s;
	cin >> s;
	return s == "true";
	#endif

	#ifdef IOI2018
	{ // --- mine stuf
		++cnt;
	}

	cout << "examine " << x << ' ' << y << endl;
	return checker :: check(x, y);
	#endif
}
pair <int, int> solve() {
	ll x, y;
	cin >> n >> x >> y;


	cnt = 0;
	ll m = 0;

	{ // --- searching right 
		ll l = 1, r = n, ans = 0;
		while (l <= r) {
			ll mid = (l + r) / 2;
			if (ask(x + mid, y) && ask(x + 2 * mid, y) && ask(x + 3 * mid, y)) ans = mid, l = mid + 1;
			else r = mid - 1;
		}
		ll add = 3 * ans;
		while (ask(x + add + 1, y)) ++add;
		ans = add;
		m += ans;
	}
	{ // --- searching left 
		ll l = 1, r = n, ans = 0;
		while (l <= r) {
			ll mid = (l + r) / 2;
			if (ask(x - mid, y) && ask(x - 2 * mid, y) && ask(x - 3 * mid, y)) ans = mid, l = mid + 1;
			else r = mid - 1;
		}
		ll add = 3 * ans;
		while (ask(x - add - 1, y)) ++add;
		ans = add;
		x -= ans;
		m += ans;
	}

	++m;
	{ // --- searching up 
		ll l = 1, r = n, ans = 0;
		while (l <= r) {
			int mid = (l + r) / 2;
			if (ask(x, y + mid) && ask(x, y + 2 * mid) && ask(x, y + 3 * mid)) ans = mid, l = mid + 1;
			else r = mid - 1;
		}
		ll add = 3 * ans;
		while (ask(x, y + add + 1)) ++add;
		ans = add;
		y += ans;
	}
	


	while (ask(x - m, y + m)) x -= m, y += m;
	while (ask(x - 2 * m, y )) x -= 2 * m;
	while (ask(x, y + 2 * m)) y += 2 * m;

	x += m / 2, y -= m / 2;
	x += 2 * m, y -= 2 * m;
	cout << "solution " << x << ' ' << y << endl;
	return {x, y};
}
int32_t main() {
	#ifdef IOI2018
		freopen ("in.txt", "r", stdin);
		//freopen ("case.txt", "w", stdout);
	#endif
	//srand(time(0));

	checker :: init(25, 1, 1, 5);

	solve();


	ioi
	ofstream out ("in.txt");
	rep(i, 1, 1000) {
		int _m = 2 * (rand() % 2 + 1) + 1, _n = 5 * _m ;
		int X = rand() % (_n - 5 * _m + 1) + 1, Y = rand() % (_n - 5 * _m + 1) + 1;
		checker :: init(_n, X, Y, _m);


		int sx = rand() % _n + 1, sy = rand() % _n + 1;
		while (!checker :: check(sx, sy)) {
			sx = rand() % _n + 1, sy = rand() % _n + 1;
		}

		out << _n << ' ' << sx << ' ' << sy << endl;
		
		pair <int, int> res = solve();

		pair <int, int> center = {X + 2 * _m + _m / 2, Y + 2 * _m + _m / 2};
		

		if (center != res) {
			cerr << _n << ' ' << _m << ' ' << sx << ' ' << sy << endl;
			cerr << res.f << ' ' << res.s << endl;
			cerr << center.f << ' ' << center.s << endl;
			assert(0);
			ioi
		}
	}

	//solve();
	ioi
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10