Submission #1054644

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054644		thieunguyenhuy	Unscrambling a Messy Bug (IOI16_messy)	C++17	0 / 100	1 ms	860 KiB

messy

#ifndef hwe
	#include "messy.h"
#endif

#include <bits/stdc++.h>
using namespace std;

#define popcount(n) (__builtin_popcountll((n)))
#define clz(n) (__builtin_clzll((n)))
#define ctz(n) (__builtin_ctzll((n)))
#define lg(n) (63 - __builtin_clzll((n)))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define MASK(i) (1ll << (i))
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define fi first
#define se second

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

template <class T1, class T2>
bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2>
bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

template <class T>
void remove_duplicate(vector<T> &ve) {
    sort (ve.begin(), ve.end());
    ve.resize(unique(ve.begin(), ve.end()) - ve.begin());
}

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
template <class T> T random(T l, T r) {
    return uniform_int_distribution<T>(l, r)(rng);
}
template <class T> T random(T r) {
    return rng() % r;
}

const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll INF = 1e18;

int n, w, r, write_counter = 0, read_counter = 0;
vector<int> ans, p;
set<string> S;

#ifdef hwe
void add_element(string a) {
	cerr <<  "Add: " << a << '\n';
	S.emplace(a);
}
void compile_set() {
	set<string> new_set;
	for (auto num : S) {
		string new_num(num.size(), '0');
		for (int i = 0; i < n; ++i) new_num[i] = num[p[i]];
		new_set.emplace(new_num);
	}
	S = new_set;
}
bool check_element(string x) {
	cerr << "Check: " << x << '\n';
	return S.find(x) != S.end();
}
#endif

void add(int l, int r, string s) {
	int mid = l + r >> 1;

	for (int i = l; i <= mid; ++i) {
		assert(++write_counter <= w);
		s[i] = '1'; add_element(s); s[i] = '0';
	}

	if (l == r) return;

	string le = s, ri = s;
	for (int i = mid + 1; i <= r; ++i) le[i] = '1';
	for (int i = l; i <= mid; ++i) ri[i] = '1';
	
	add(l, mid, le);
	add(mid + 1, r, ri);
}

void check(int l, int r, string s) {
	if (l == r) {
		int before = ans.size();
		for (int i = 0; i < s.size(); ++i) {
			if (s[i] == '0') ans.emplace_back(i);
		}
		return;
	}

	int mid = l + r >> 1;

	string le = s, ri = s;
	for (int i = 0; i < s.size(); ++i) {
		if (s[i] == '1') continue;
		assert(++read_counter <= r);
		s[i] = '1'; bool flag = check_element(s); s[i] = '0';
		if (flag) le[i] = '0', ri[i] = '1';
		else le[i] = '1', ri[i] = '0';
	}

	check(l, mid, le);
	check(mid + 1, r, ri);
}

vector<int> restore_permutation(int _n, int _w, int _r) {
	n = _n, w = _w, r = _r;
	write_counter = read_counter = 0;
	ans.clear(); ans.reserve(n);
	add(0, n - 1, string(n, '0'));
	compile_set();
	check(0, n - 1, string(n, '0'));
	return ans;
}

#ifdef hwe
signed main() {
	cin >> n;

	p.resize(n);
	for (auto &x : p) cin >> x;

	vector<int> perm = restore_permutation(n, 0, 0);
	for (auto &x : perm) cerr << x << ' ';

    cerr << '\n'; return 0;
}
#endif

Compilation message (stderr)

messy.cpp: In function 'void add(int, int, std::string)':
messy.cpp:95:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   95 |  int mid = l + r >> 1;
      |            ~~^~~
messy.cpp: In function 'void check(int, int, std::string)':
messy.cpp:115:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |   for (int i = 0; i < s.size(); ++i) {
      |                   ~~^~~~~~~~~~
messy.cpp:114:7: warning: unused variable 'before' [-Wunused-variable]
  114 |   int before = ans.size();
      |       ^~~~~~
messy.cpp:121:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  121 |  int mid = l + r >> 1;
      |            ~~^~~
messy.cpp:124:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  124 |  for (int i = 0; i < s.size(); ++i) {
      |                  ~~^~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 18
• Subtask 3: 0 / 11
• Subtask 4: 0 / 21
• Subtask 5: 0 / 30