Submission #899609

#	Time	Username	Problem	Language	Result	Execution time	Memory
899609		marvinthang	Coreputer (IOI23_coreputer)	C++17	100 / 100	1 ms	596 KiB

coreputer

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

using namespace std;

#define fi first
#define se second
#define BIT(x, i) ((x) >> (i) & 1)
#define MASK(i) (1LL << (i))
#define left ___left
#define right ___right
#define ALL(v) (v).begin(), (v).end()
#define REP(i, n) for (int i = 0, _n = (n); i < _n; ++i)
#define REPD(i, n) for (int i = (n); i-- > 0; )
#define FOR(i, a, b) for (int _b = (b), i = (a); i < _b; ++i)
#define FORD(i, b, a) for (int _a = (a), i = (b); i-- > _a; )
#define FORE(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORDE(i, b, a) for (int i = (b), _a = (a); i >= _a; --i)
#define scan_op(...) istream & operator >> (istream &in, __VA_ARGS__ &u)
#define print_op(...) ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }

template <class U, class V> scan_op(pair <U, V>) { return in >> u.fi >> u.se; }
template <class T> scan_op(vector <T>) { for (T &x: u) in >> x; return in; }
template <class U, class V> print_op(pair <U, V>) { return out << "(" << u.fi << ", " << u.se << ")"; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")"; else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple <U...>) { return print_tuple_utils<0, tuple <U...>> (out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream &>::type operator << (ostream &out, const Con &u) { out << "{"; for (auto it = u.begin(); it != u.end(); ++it) out << (it == u.begin() ? "" : ", ") << *it; return out << "}"; }

vector <int> malfunctioning_cores(int N) {
	vector <int> f(N);
	auto ask = [&] {
		vector <int> v;
		REP(i, N) if (f[i]) v.push_back(i);
		if (v.empty()) return -1;
		if (v.size() == N) return 1;
		return run_diagnostic(v);
	};
	int l = 1, r = N - 1;
	bool eq = false;
	while (l <= r) {
		int m = l + r >> 1;
		REP(i, N) f[i] = i < m;
		int k = ask();
		eq |= !k;
		if (k <= 0) l = m + 1;
		else r = m - 1;
	}
	vector <int> res(N, 0);
	res[r] = 1;
	REP(i, N) f[i] = (i < r);
	if (r == N - 1) {
		if (!eq) return res;
		REP(i, N - 2) {
			f[i] = 0;
			if (ask() < 0) {
				res[i] = 1;
				return res;
			}			
			f[i] = 1;
		}
		res[N - 2] = 1;
		return res;
	}
	if (eq) {
		int cnt = -1;
		REP(i, r) {
			f[i] = 0;
			if (ask() < 0) {
				res[i] = 1;
				++cnt;
			}
			f[i] = 1;
		}
		FOR(i, r + 1, N - 1) {
			f[i] = 1;
			if (ask() > 0) {
				res[i] = 1;
				--cnt;
			}
			f[i] = 0;
		}
		if (cnt) res[N - 1] = 1;
		return res;
	}
	int cnt = 0;
	f[r] = 1;
	REP(i, r) {
		f[i] = 0;
		if (ask() < 0) {
			res[i] = 1;
			++cnt;
		}
		f[i] = 1;
	}
	f[r] = 0;
	FOR(i, r + 1, N - 1) {
		f[i] = 1;
		if (ask() > 0) {
			res[i] = 1;
			--cnt;
		}
		f[i] = 0;
	}
	if (cnt) res[N - 1] = 1;
	return res;
}

Compilation message (stderr)

coreputer.cpp: In lambda function:
coreputer.cpp:36:16: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |   if (v.size() == N) return 1;
      |       ~~~~~~~~~^~~~
coreputer.cpp: In function 'std::vector<int> malfunctioning_cores(int)':
coreputer.cpp:42:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   42 |   int m = l + r >> 1;
      |           ~~^~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40