oj.uz

답안 #1090408

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1090408 2024-09-18T10:45:12 Z lucri COVID tests (CEOI24_covid) C++17
59.5 / 100
 2089 ms 344 KB 
#include <bits/stdc++.h>
/// You may use:

// The number of students
int N,T;

// 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;
std::vector<bool> test;
std::vector<int> ind;
int p[1010];
void calculeaza(int b,int e,int sz)
{
    if(b>e)
        return;
    int ce=e;
    e=std::min(e,b+2*sz-1);
    while(b<=e)
    {
        int mid=(b+e)/2;
        for(int i=b;i<=mid;++i)
            test[p[i]]=1;
        bool r=test_students(test);
        for(int i=b;i<=mid;++i)
            test[p[i]]=0;
        if(r==false)
            b=mid+1;
        else
            e=mid-1;
    }
    if(b<=ce)
    {
        answer[p[b]]=1;
        calculeaza(b+1,ce,sz);
    }
    return;
}
void raspunde(int sz)
{
    p[0]=0;
    for(int i=0;i<N;i+=sz)
    {
        for(int j=i;j<i+sz&&j<N;++j)
            test[j]=1;
        if(test_students(test)==true)
        {
            for(int j=i;j<i+sz&&j<N;++j)
                p[++p[0]]=j;
        }
        for(int j=i;j<i+sz&&j<N;++j)
            test[j]=0;
    }
    calculeaza(1,p[0],sz);
}
std::vector<bool> find_positive()
{
    for(int i=0;i<N;++i)
    {
        answer[i]=test[i]=0;
        ind[i]=i;
    }
    random_shuffle(ind.begin(),ind.end());
    if(T==1)//subtask 1
    {
        raspunde(1);
    }
    else if(P>0.17)//P=0.2
    {
        raspunde(3);
    }
    else if(P>0.11)//P=0.158765
    {
        raspunde(4);
    }
    else if(P>0.1)//P=0.104571
    {
        raspunde(6);
    }
    else if(P>0.06)//P=0.068648
    {
        raspunde(10);
    }
    else if(P>0.03)//P=0.039856
    {
        raspunde(17);
    }
    else if(P>0.02)//P=0.028545
    {
        raspunde(24);
    }
    else if(P>0.01)//P=0.011546
    {
        raspunde(50);
    }
    else if(P>0.005)//P=0.005256
    {
        raspunde(100);
    }
    else//P=0.001
    {
        raspunde(500);
    }
    return answer;
}

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

    // You may perform any extra initialization here.
    srand(time(0));
    answer.resize(N);
    ind.resize(N);
    test.resize(N);
    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 'bool test_students(std::vector<bool>)':
Main.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:134:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:153:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  153 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 10 ms 344 KB Output is correct
2 Correct 9 ms 344 KB Output is correct
3 Correct 12 ms 344 KB Output is correct
4 Correct 10 ms 344 KB Output is correct
5 Correct 13 ms 344 KB Output is correct
6 Correct 12 ms 344 KB Output is correct
7 Correct 8 ms 344 KB Output is correct
8 Correct 10 ms 344 KB Output is correct
9 Correct 11 ms 344 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 11 ms 344 KB Output is correct
12 Correct 12 ms 344 KB Output is correct
13 Correct 12 ms 344 KB Output is correct
14 Correct 9 ms 344 KB Output is correct
15 Correct 8 ms 344 KB Output is correct
16 Correct 12 ms 344 KB Output is correct
17 Correct 6 ms 344 KB Output is correct

Subtask #2
49.5 / 90.0

# 결과 실행 시간 메모리 Grader output
1 Correct 44 ms 344 KB Output is correct (P=0.001, F=15.1, Q=15.0) -> 90.00 points
2 Correct 123 ms 344 KB Output is correct (P=0.005256, F=51.1, Q=53.6) -> 75.27 points
3 Correct 246 ms 344 KB Output is correct (P=0.011546, F=94.9, Q=100.1) -> 73.82 points
4 Correct 462 ms 344 KB Output is correct (P=0.028545, F=191.5, Q=204.7) -> 70.55 points
5 Correct 631 ms 344 KB Output is correct (P=0.039856, F=246.3, Q=265.6) -> 68.52 points
6 Correct 956 ms 344 KB Output is correct (P=0.068648, F=366.2, Q=402.8) -> 64.30 points
7 Correct 1355 ms 344 KB Output is correct (P=0.104571, F=490.3, Q=551.0) -> 60.19 points
8 Correct 1682 ms 344 KB Output is correct (P=0.158765, F=639.1, Q=723.2) -> 58.96 points
9 Correct 2089 ms 344 KB Output is correct (P=0.2, F=731.4, Q=881.0) -> 49.50 points