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#528539#9162. COVID testsDimash#0 1158ms4000kbC++232.7kb2024-08-23 15:58:512024-08-23 15:58:51

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你现在查看的是最新测评结果

  • [2024-08-23 15:58:51]
  • 评测
  • 测评结果:0
  • 用时:1158ms
  • 内存:4000kb
  • [2024-08-23 15:58:51]
  • 提交

answer

#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
#include <bits/stdc++.h>
using namespace std;;
/// You may use:
string s;
// 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 loc = 0;
bool test_students(std::vector<bool> mask) {
    if(loc) {
        bool ans = false;
        for(int i = 0; i < N; i++) {
            if(mask[i] && s[i] == '1') {
                ans = 1;
            }
        }
        return ans;
    }
    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.
bool as(int l,int r) {
    vector<bool> ask(N,0);
    for(int i = l;i <= min(N - 1,r);i++) {
        ask[i] = 1;
    }
    return test_students(ask);
}
std::vector<bool> find_positive() {
    vector<bool> answer(N),ask(N,0);
    int i = 0;
    while(i < N) {
        int l = i - 1,r = N;
        bool ok = false;
        while(r - l > 1) {
            int mid = (l + r) >> 1;
            if(as(i,mid)) {
                r = mid;
            } else {
                l = mid;
                ok = 1;
                i = mid + 1;
                break;
            }
        }
        if(ok) continue;
        if(r < N) {
            answer[r] = 1;
            i = r + 1;
        } else {
            break;
        }
    }
    return answer;
}

int main() {
    int T;
    scanf("%d %lf %d", &N, &P, &T);
    if(loc) cin >> s;
    // 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;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Wrong Answer

Test #1:

score: 0
Wrong Answer
time: 39ms
memory: 3744kb

input:

1000 0.789673 1
P
P
P
P
P
P
P
P
P
P
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P
P
P
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P
N
P
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.0 0.0 translate:wrong

Subtask #2:

score: 0
Interactor Memory Limit Exceeded

Test #18:

score: 14.23
Acceptable Answer
time: 23ms
memory: 3864kb

input:

1000 0.001 300
N
N
N
N
N
N
N
N
N
N
C
N
P
N
P
P
N
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N...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.15811111110 0.1581111111 Output is correct (P=0.001, F=15.1, Q=35.2) -> 14.23 points

Test #19:

score: 10.61
Acceptable Answer
time: 103ms
memory: 3900kb

input:

1000 0.005256 300
P
P
P
N
P
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.11788888890 0.1178888889 Output is correct (P=0.005256, F=51.1, Q=146.7) -> 10.61 points

Test #20:

score: 9.23
Acceptable Answer
time: 224ms
memory: 3744kb

input:

1000 0.011546 300
P
P
P
P
P
N
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.10255555560 0.1025555556 Output is correct (P=0.011546, F=94.9, Q=302.5) -> 9.23 points

Test #21:

score: 7.74
Acceptable Answer
time: 524ms
memory: 3732kb

input:

1000 0.028545 300
P
P
P
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.0860 0.086 Output is correct (P=0.028545, F=191.5, Q=700.0) -> 7.74 points

Test #22:

score: 7.28
Acceptable Answer
time: 708ms
memory: 4000kb

input:

1000 0.039856 300
P
P
P
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N
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.08088888890 0.0808888889 Output is correct (P=0.039856, F=246.3, Q=945.6) -> 7.28 points

Test #23:

score: 6.68
Acceptable Answer
time: 1158ms
memory: 3816kb

input:

1000 0.068648 300
P
P
P
P
P
P
N
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P
N
P
P
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N
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N
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N
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N
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.07422222220 0.0742222222 Output is correct (P=0.068648, F=366.2, Q=1508.5) -> 6.68 points

Test #24:

score: 6.68
Acceptable Answer
time: 1158ms
memory: 3816kb

input:

1000 0.104571 300
P
P
P
P
P
N
P
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P
P
N
P
P
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P
P
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N
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N
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N
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.07422222220 0.0742222222 Output is correct (P=0.068648, F=366.2, Q=1508.5) -> 6.68 points

Test #25:

score: 0
Interactor Memory Limit Exceeded

input:

1000 0.158765 300
P
P
P
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P
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result: