oj.uz

Submission #1082950

# Submission time Handle Problem Language Result Execution time Memory
1082950 2024-09-02T08:22:57 Z mychecksedad COVID tests (CEOI24_covid) C++17
0 / 100
 9 ms 344 KB 
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define all(x) x.begin(),x.end()
#define ll long long int
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
#define en cout << '\n'

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.
void find_positive(vector<bool> answer) {
	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);
}

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

    if(P > 0.2){
    	for(int i = 0; i < T; ++i){
    		vector<bool> ans(N), arr(N);
    		for(int j = 0; j < N; ++j){
    			arr[j] = 1;
    			ans[j] = test_students(arr);
    			arr[j] = 0;
    		}
    		find_positive(ans);
    	}
    	return 0;
    }


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

        
    // }

    return 0;
}

Compilation message

Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'void find_positive(std::vector<bool>)':
Main.cpp:51:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |   scanf(" %c", &verdict);
      |   ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:58:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   58 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct

Subtask #1
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 344 KB Output is correct
2 Correct 6 ms 344 KB Output is correct
3 Correct 6 ms 344 KB Output is correct
4 Correct 8 ms 344 KB Output is correct
5 Correct 9 ms 344 KB Output is correct
6 Correct 6 ms 344 KB Output is correct
7 Correct 6 ms 344 KB Output is correct
8 Correct 8 ms 344 KB Output is correct
9 Correct 6 ms 344 KB Output is correct
10 Incorrect 0 ms 344 KB Unexpected end of file - token expected
11 Halted 0 ms 0 KB -

Subtask #2
0.0 / 90.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 344 KB Unexpected end of file - token expected
2 Halted 0 ms 0 KB -