oj.uz

Submission #1044469

# Submission time Handle Problem Language Result Execution time Memory
1044469 2024-08-05T10:00:02 Z Tsovak COVID tests (CEOI24_covid) C++17
27.81 / 100
 2224 ms 344 KB 
// -------------------- Includes -------------------- //
#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <stdio.h>
#include <cstdlib>
#include <stdlib.h>
#include <array>
#include <string>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <math.h>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <bitset>
#include <list>
#include <iterator>
#include <numeric>
#include <complex>
#include <tuple>
#include <utility>
#include <cassert>
#include <assert.h>
#include <climits>
#include <limits.h>
#include <ctime>
#include <time.h>
#include <random>
#include <chrono>
#include <fstream>
using namespace std;

// -------------------- Typedefs -------------------- //

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

// -------------------- Defines -------------------- //

#define pr pair
#define mpr make_pair
#define ff first
#define ss second

#define mset multiset
#define mmap multimap
#define uset unordered_set
#define umap unordered_map
#define umset unordered_multiset
#define ummap unordered_multimap
#define pqueue priority_queue

#define sz(x) (int((x).size()))
#define len(x) (int((x).length()))
#define all(x) (x).begin(), (x).end()
#define clr(x) (x).clear()

#define ft front
#define bk back
#define pf push_front
#define pb push_back
#define popf pop_front
#define popb pop_back

#define lb lower_bound
#define ub upper_bound
#define bs binary_search

// -------------------- Constants -------------------- //

const int MAX = int(1e9 + 5);
const ll MAXL = ll(1e18 + 5);
const ll MOD = ll(1e9 + 7);
const ll MOD2 = ll(998244353);

// -------------------- Solution -------------------- //

/// You may use:

// The number of students
int N;

// The probability any given student is positive
double P;

// This function performs a test on a subset of samples.
// Its argument is a vector of Booleans of length N,
// where the i-th element is true if the i-th sample should be added to the mix.
// It returns true if (and only if) at least one of the samples in the mix is positive.
bool test_students(std::vector<bool> mask) {
	assert(mask.size() == (size_t)N);

	std::string mask_str(N, ' ');
	for (int i = 0; i < N; i++)
		mask_str[i] = mask[i] ? '1' : '0';

	printf("Q %s\n", mask_str.c_str());
	fflush(stdout);

	char answer;
	scanf(" %c", &answer);
	return answer == 'P';
}

/// You should implement:

// This function will be called once for each test instance.
// It should use test_students to determine which samples are positive.
// It must return a vector of Booleans of length N,
// where the i-th element is true if and only if the i-th sample is positive.
vector<bool> ans;

void calc(int tl, int tr)
{
	//cout << tl << ' ' << tr << "\n";
	if (tl == tr) {
		ans.pb(1);
		return;
	}

	int m = (tl + tr) / 2;

	vector<bool> msk(N, 0);
	for (int i = tl; i <= m; i++) msk[i - 1] = 1;

	if (test_students(msk)) calc(tl, m);
	else for (int i = tl; i <= m; i++) ans.pb(0);

	for (int i = tl; i <= m; i++) msk[i - 1] = 0;
	for (int i = m + 1; i <= tr; i++) msk[i - 1] = 1;

	if (test_students(msk)) calc(m + 1, tr);
	else for (int i = m + 1; i <= tr; i++) ans.pb(0);

	return;
}

vector<bool> find_positive()
{
	int i, j;

	clr(ans);

	int h = ceil(db(N) * P);

	int l, r;

	int len = N / 10;

	for (i = 1; i <= N; i += len) {
		calc(i, i + len - 1);
	}

	return ans;
}

int main() {
	int T;
	scanf("%d %lf %d", &N, &P, &T);

	// You may perform any extra initialization here.

	for (int i = 0; i < T; i++) {
		std::vector<bool> answer = find_positive();
		assert(answer.size() == (size_t)N);

		std::string answer_str(N, ' ');
		for (int j = 0; j < N; j++)
			answer_str[j] = answer[j] ? '1' : '0';

		printf("A %s\n", answer_str.c_str());
		fflush(stdout);

		char verdict;
		scanf(" %c", &verdict);
		if (verdict == 'W')
			exit(0);
	}

	return 0;
}

Compilation message

Main.cpp: In function 'std::vector<bool> find_positive()':
Main.cpp:151:9: warning: unused variable 'j' [-Wunused-variable]
  151 |  int i, j;
      |         ^
Main.cpp:155:6: warning: unused variable 'h' [-Wunused-variable]
  155 |  int h = ceil(db(N) * P);
      |      ^
Main.cpp:157:6: warning: unused variable 'l' [-Wunused-variable]
  157 |  int l, r;
      |      ^
Main.cpp:157:9: warning: unused variable 'r' [-Wunused-variable]
  157 |  int l, r;
      |         ^
Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:112:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  112 |  scanf(" %c", &answer);
      |  ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:170:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  170 |  scanf("%d %lf %d", &N, &P, &T);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:186:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  186 |   scanf(" %c", &verdict);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB translate:wrong
2 Halted 0 ms 0 KB -

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 344 KB Output is correct
2 Correct 10 ms 344 KB Output is correct
3 Correct 11 ms 344 KB Output is correct
4 Correct 10 ms 344 KB Output is correct
5 Correct 10 ms 344 KB Output is correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 8 ms 344 KB Output is correct
8 Correct 8 ms 344 KB Output is correct
9 Correct 13 ms 344 KB Output is correct
10 Correct 5 ms 344 KB Output is correct
11 Correct 8 ms 344 KB Output is correct
12 Correct 8 ms 344 KB Output is correct
13 Correct 9 ms 344 KB Output is correct
14 Correct 8 ms 344 KB Output is correct
15 Correct 9 ms 344 KB Output is correct
16 Correct 9 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct

Subtask #2
17.810000001 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 51 ms 344 KB Output is correct (P=0.001, F=15.1, Q=30.4) -> 17.81 points
2 Correct 154 ms 344 KB Output is correct (P=0.005256, F=51.1, Q=76.1) -> 30.44 points
3 Correct 286 ms 344 KB Output is correct (P=0.011546, F=94.9, Q=139.2) -> 31.39 points
4 Correct 568 ms 344 KB Output is correct (P=0.028545, F=191.5, Q=289.3) -> 29.58 points
5 Correct 748 ms 344 KB Output is correct (P=0.039856, F=246.3, Q=375.1) -> 29.11 points
6 Correct 1084 ms 344 KB Output is correct (P=0.068648, F=366.2, Q=558.5) -> 29.03 points
7 Correct 1463 ms 344 KB Output is correct (P=0.104571, F=490.3, Q=743.3) -> 29.37 points
8 Correct 1891 ms 344 KB Output is correct (P=0.158765, F=639.1, Q=964.4) -> 29.64 points
9 Correct 2224 ms 344 KB Output is correct (P=0.2, F=731.4, Q=1111.4) -> 29.24 points