Submission #60980

#	Time	Username	Problem	Language	Result	Execution time	Memory
60980		kingpig9	Cup of Jamshid (IOI17_cup)	C++11	100 / 100	4 ms	376 KiB

cup

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

using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define debug(...) fprintf(stderr, __VA_ARGS__)
#define fi first
#define se second
#define all(v) (v).begin(), (v).end()
#define fillchar(a, s) memset((a), (s), sizeof(a))

bool isdesert (int x) {
	return abs(x) <= 5e8;
}

bool isdesert (int x, int y) {
	return isdesert(x) && isdesert(y);
}

pii _find_cup() {
	//find the x value first
	int dbase = ask_shahrasb(5e8, 5e8);
	int dx = 0;
	for (int i = 0; i <= 28; i++) {
		int di = ask_shahrasb(5e8 + (1 << i), 5e8) ^ dbase;
		di = ((di >> i) + 1) / 2;
		assert((di & (di - 1)) == 0);

		if (di != 1) {
			dx ^= (1 << i);
		}
	}

	//hmm we need to find the 2^29 digit in a special way.
	//this is the most annoying part...

	int x[2] = {int(5e8) - dx, int(5e8) - (dx ^ (1 << 29))};
	int dy = dbase ^ dx;
	int y[2] = {int(5e8) - dy, int(5e8) - (dy ^ (1 << 29))};
	vector<pii> poss;
	for (int i = 0; i < 2; i++) {
		if (!isdesert(x[i])) {
			continue;
		}

		for (int j = 0; j < 2; j++) {
			if (!isdesert(y[j])) {
				continue;
			}

			if (dbase != ((int(5e8) - x[i]) ^ (int(5e8) - y[j]))) {
				continue;
			}
			poss.push_back({x[i], y[j]});
			//return vector<int> {x[i], y[i]};
		}
	}

	//ok which of them is actually the one?
	if (poss.size() == 1) {
		return pii(poss[0].fi, poss[0].se);
	}
	assert(poss.size() == 2);
	sort(all(poss));

	if (poss[0].se < poss[1].se) {
		if (ask_shahrasb(poss[0].fi + 2, poss[0].se + 1) == 3) {
			return poss[0];
		}
		return poss[1];
	} else {
		if (ask_shahrasb(poss[0].fi + 2, poss[0].se - 1) == 3) {
			return poss[0];
		} else {
			return poss[1];
		}
	}
}

vector<int> find_cup() {
	pii p = _find_cup();
	return vector<int> {p.fi, p.se};
}

• Subtask 1: 100 / 100