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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#528575#9162. COVID testsDimash#27.32 843ms4128kbC++233.3kb2024-08-23 16:25:222024-08-23 16:25:23

Judging History

你现在查看的是最新测评结果

  • [2024-08-23 16:25:23]
  • 评测
  • 测评结果:27.32
  • 用时:843ms
  • 内存:4128kb
  • [2024-08-23 16:25:22]
  • 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());
mt19937 rng(12321);
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[ord[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: 0ms
memory: 3752kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.0 0.0 translate:wrong

Subtask #2:

score: 27.32
Acceptable Answer

Test #18:

score: 50.15
Acceptable Answer
time: 18ms
memory: 4004kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

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

Test #19:

score: 74.3
Acceptable Answer
time: 32ms
memory: 4040kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.82555555560 0.8255555556 Output is correct (P=0.005256, F=51.1, Q=53.8) -> 74.30 points

Test #20:

score: 57.83
Acceptable Answer
time: 76ms
memory: 3948kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.64255555560 0.6425555556 Output is correct (P=0.011546, F=94.9, Q=108.1) -> 57.83 points

Test #21:

score: 38.79
Acceptable Answer
time: 186ms
memory: 3816kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.4310 0.431 Output is correct (P=0.028545, F=191.5, Q=254.7) -> 38.79 points

Test #22:

score: 27.32
Acceptable Answer
time: 253ms
memory: 4108kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.30355555560 0.3035555556 Output is correct (P=0.039856, F=246.3, Q=387.6) -> 27.32 points

Test #23:

score: 27.92
Acceptable Answer
time: 375ms
memory: 3812kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.31022222220 0.3102222222 Output is correct (P=0.068648, F=366.2, Q=569.8) -> 27.92 points

Test #24:

score: 28.7
Acceptable Answer
time: 784ms
memory: 3868kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.31888888890 0.3188888889 Output is correct (P=0.104571, F=490.3, Q=752.1) -> 28.70 points

Test #25:

score: 29.43
Acceptable Answer
time: 843ms
memory: 4128kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.3270 0.327 Output is correct (P=0.158765, F=639.1, Q=968.0) -> 29.43 points

Test #26:

score: 29.14
Acceptable Answer
time: 784ms
memory: 4056kb

input:

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

output:

Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...

result:

points 0.32377777780 0.3237777778 Output is correct (P=0.2, F=731.4, Q=1113.3) -> 29.14 points