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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#528571#9162. COVID testsDimash#27.33 905ms4124kbC++233.3kb2024-08-23 16:24:112024-08-23 16:24:11

Judging History

你现在查看的是最新测评结果

  • [2024-08-23 16:24:11]
  • 评测
  • 测评结果:27.33
  • 用时:905ms
  • 内存:4124kb
  • [2024-08-23 16:24:11]
  • 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.
vector<int> ord;
bool as(int l,int r) {
    vector<bool> ask(N,0);
    for(int i = l;i <= min(N - 1,r);i++) {
        ask[ord[i]] = 1;
    }
    return test_students(ask);
}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
std::vector<bool> find_positive() {
    vector<bool> answer(N),ask(N,0);
    ord.resize(N);
    iota(ord.begin(),ord.end(),0);
    // shuffle(ord.begin(),ord.end(),rng);
    int col = 0;
    function<void(int,int)>go = [&](int l,int r) {
        if(l > r) return;
        if(l == r) {
            col++;
            answer[ord[l]] = 1;
            return;
        }
        int mid = (l + r) >> 1;
        if(as(l,mid)) {
            go(l,mid);
        }
        if(col < 250 && as(mid+1,r)) {
            go(mid+1,r);
        }
    };
    if(P > 0.028545) go(0,N-1);
    else {
        int i = 0;
        while(i < N) {
            int l = i - 1,r = N;
            while(r - l > 1) {
                int mid = (l + r) >> 1;
                if(as(i,mid)) {
                    r = mid;
                } else {
                    l = mid;
                }
            }
            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;
}

詳細信息

Subtask #1:

score: 0
Wrong Answer

Test #1:

score: 0
Wrong Answer
time: 6ms
memory: 3844kb

input:

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

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.0 0.0 translate:wrong

Subtask #2:

score: 27.33
Acceptable Answer

Test #18:

score: 50.15
Acceptable Answer
time: 24ms
memory: 4124kb

input:

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

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.55722222220 0.5572222222 Output is correct (P=0.001, F=15.1, Q=18.1) -> 50.15 points

Test #19:

score: 72.43
Acceptable Answer
time: 52ms
memory: 3892kb

input:

1000 0.005256 300
P
P
P
N
N
P
P
P
P
P
P
P
P
P
P
P
N
P
N
N
P
N
N
P
P
P
P
N
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N
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P
N
N
P
N
N
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N
N
N
P
P
N
N
P
N
N
N
N
N
N
N
C
N
P
P
N
N
P
N
N
P
P
N
P
N
P
P
P
P
N
N
P
N
P
N
N
N
N
N
N
N
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N
C
N
N
N
P
N
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N
P
N
N
N
N
N
N
N
C
P
P
N
P
P
N
N
N
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N
P
P
N
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N
N
P
P
N
N
P
P
P
P
P
P
N
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P
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P
N
P
...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.80477777780 0.8047777778 Output is correct (P=0.005256, F=51.1, Q=54.2) -> 72.43 points

Test #20:

score: 57.98
Acceptable Answer
time: 82ms
memory: 3924kb

input:

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

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.64422222220 0.6442222222 Output is correct (P=0.011546, F=94.9, Q=108.0) -> 57.98 points

Test #21:

score: 39.39
Acceptable Answer
time: 223ms
memory: 4032kb

input:

1000 0.028545 300
P
P
P
P
P
P
P
P
P
P
P
P
N
P
N
P
P
P
N
P
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P
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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P
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N
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P
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N
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P
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N
P
P
P
P
P
P
P
P
P
P
N
P
P
P
P
P
P
P
P
P
N
P
N
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N
P
P
P
P
P
N
P
N
N
P
P
P
P
P
N
P
P
N
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N
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P
P
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.43766666670 0.4376666667 Output is correct (P=0.028545, F=191.5, Q=253.0) -> 39.39 points

Test #22:

score: 27.33
Acceptable Answer
time: 227ms
memory: 3892kb

input:

1000 0.039856 300
P
P
P
P
P
P
N
P
P
P
N
P
N
N
P
N
P
N
P
P
N
P
N
P
P
P
P
P
N
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N
P
P
N
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N
P
P
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P
P
N
N
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P
P
P
P
N
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P
P
N
P
P
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N
P
P
P
N
P
P
N
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N
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P
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N
P
P
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N
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...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.30366666670 0.3036666667 Output is correct (P=0.039856, F=246.3, Q=387.5) -> 27.33 points

Test #23:

score: 28.05
Acceptable Answer
time: 370ms
memory: 3972kb

input:

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

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.31166666670 0.3116666667 Output is correct (P=0.068648, F=366.2, Q=568.4) -> 28.05 points

Test #24:

score: 28.83
Acceptable Answer
time: 497ms
memory: 3900kb

input:

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

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.32033333330 0.3203333333 Output is correct (P=0.104571, F=490.3, Q=750.4) -> 28.83 points

Test #25:

score: 29.51
Acceptable Answer
time: 649ms
memory: 4060kb

input:

1000 0.158765 300
P
P
P
P
P
N
P
P
P
P
P
N
N
P
N
P
P
N
N
P
P
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N
N
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N
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P
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N
N
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N
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P
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P
N
N
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P
N
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P
P
N
P
N
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N
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P
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P
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N
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N
...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.32788888890 0.3278888889 Output is correct (P=0.158765, F=639.1, Q=966.6) -> 29.51 points

Test #26:

score: 29.23
Acceptable Answer
time: 905ms
memory: 3900kb

input:

1000 0.2 300
P
P
P
P
P
P
P
N
P
P
P
N
N
P
P
P
N
P
P
N
P
N
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N
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N
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N
P
P
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P
P
P
P
N
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P
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P
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P
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N
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P
P
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P
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P
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P
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N
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N
P
N
P...

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 0.32477777780 0.3247777778 Output is correct (P=0.2, F=731.4, Q=1111.6) -> 29.23 points