oj.uz

답안 #1119822

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1119822 2024-11-27T13:28:54 Z Tenis0206 COVID tests (CEOI24_covid) C++11
10 / 100
 4860 ms 336 KB 
#include <bits/stdc++.h>

using namespace std;

/// 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.

std::vector<bool> answer;

bool my_test_students(int st, int dr)
{
    vector<bool> mask(N);
    for(int i=st;i<=dr;i++)
    {
        mask[i] = true;
    }
    return test_students(mask);
}

void divide(int st, int dr)
{
    if(st == dr)
    {
        answer[st] = true;
        return;
    }
    int mij = (st + dr) >> 1;
    bool ok_st = my_test_students(st, mij);
    bool ok_dr = my_test_students(mij + 1, dr);
    if(ok_st)
    {
        divide(st, mij);
    }
    if(ok_dr)
    {
        divide(mij + 1, dr);
    }
}

void find_positive() {

    divide(0, N-1);
}

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++) {
        answer.resize(N);
        for(int j=0;j<N;j++)
        {
            answer[j] = false;
        }
        find_positive();

        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 'bool test_students(std::vector<bool>)':
Main.cpp:28:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:78:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:98:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   98 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 336 KB Output is correct

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 336 KB Output is correct
2 Correct 31 ms 336 KB Output is correct
3 Correct 35 ms 336 KB Output is correct
4 Correct 31 ms 336 KB Output is correct
5 Correct 32 ms 336 KB Output is correct
6 Correct 34 ms 336 KB Output is correct
7 Correct 33 ms 336 KB Output is correct
8 Correct 28 ms 336 KB Output is correct
9 Correct 29 ms 336 KB Output is correct
10 Correct 18 ms 336 KB Output is correct
11 Correct 28 ms 336 KB Output is correct
12 Correct 26 ms 336 KB Output is correct
13 Correct 28 ms 336 KB Output is correct
14 Correct 26 ms 336 KB Output is correct
15 Correct 32 ms 336 KB Output is correct
16 Correct 32 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct

Subtask #2
0.0 / 90.0

# 결과 실행 시간 메모리 Grader output
1 Correct 106 ms 336 KB Output is correct (P=0.001, F=15.1, Q=17.7) -> 53.29 points
2 Correct 448 ms 336 KB Output is correct (P=0.005256, F=51.1, Q=77.0) -> 29.73 points
3 Correct 885 ms 336 KB Output is correct (P=0.011546, F=94.9, Q=149.0) -> 27.44 points
4 Correct 1746 ms 336 KB Output is correct (P=0.028545, F=191.5, Q=302.5) -> 27.12 points
5 Correct 2419 ms 336 KB Output is correct (P=0.039856, F=246.3, Q=387.5) -> 27.33 points
6 Correct 3367 ms 336 KB Output is correct (P=0.068648, F=366.2, Q=568.4) -> 28.05 points
7 Correct 4307 ms 336 KB Output is correct (P=0.104571, F=490.3, Q=750.4) -> 28.83 points
8 Execution timed out 4860 ms 336 KB Time limit exceeded (wall clock)
9 Halted 0 ms 0 KB -