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#528611#9162. COVID testsDimash#40.91 814ms4076kbC++233.4kb2024-08-23 16:51:472024-08-23 16:51:51

Judging History

你现在查看的是最新测评结果

  • [2024-08-23 16:51:51]
  • 评测
  • 测评结果:40.91
  • 用时:814ms
  • 内存:4076kb
  • [2024-08-23 16:51:47]
  • 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:

mt19937 rng(123321);
// 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);
    function<void(int,int)>go = [&](int l,int r) {
        if(l > r) return;
        if(l == r) {
            answer[l] = 1;
            return;
        }
        int mid = (l + r) >> 1;
        if(as(l,mid)) {
            go(l,mid);
        }
        if(as(mid+1,r)) {
            go(mid+1,r);
        }
    };
    auto solve = [&](int b) {
        int i = 0;
        while(i < N) {
            int r = min(N - 1,i + b);
            if(N - r < 7) {
                r = N;
            }
            if(as(i,r)) {
                go(i,r);
            }
            i = r + 1;
        }
    };
    if(P > 0.011546){
        solve(31);
    } 
    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;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 10
Accepted

Test #1:

score: 10
Accepted
time: 22ms
memory: 3828kb

input:

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

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #2:

score: 10
Accepted
time: 8ms
memory: 4064kb

input:

1000 0.686378 1
P
P
P
P
P
N
P
N
P
P
N
P
N
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #3:

score: 10
Accepted
time: 13ms
memory: 4056kb

input:

1000 0.873862 1
P
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #4:

score: 10
Accepted
time: 21ms
memory: 3764kb

input:

1000 0.669578 1
P
P
P
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N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #5:

score: 10
Accepted
time: 7ms
memory: 3924kb

input:

1000 0.907052 1
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #6:

score: 10
Accepted
time: 10ms
memory: 4024kb

input:

1000 0.844418 1
P
P
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #7:

score: 10
Accepted
time: 12ms
memory: 3908kb

input:

1000 0.533576 1
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #8:

score: 10
Accepted
time: 9ms
memory: 3988kb

input:

1000 0.415944 1
P
P
P
N
P
N
P
N
P
P
P
N
P
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #9:

score: 10
Accepted
time: 5ms
memory: 3888kb

input:

1000 0.596017 1
P
P
P
P
P
P
N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #10:

score: 10
Accepted
time: 0ms
memory: 3952kb

input:

1000 0.157686 1
P
P
N
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N
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N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #11:

score: 10
Accepted
time: 0ms
memory: 4076kb

input:

1000 0.380215 1
P
P
P
P
N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #12:

score: 10
Accepted
time: 2ms
memory: 3904kb

input:

1000 0.432565 1
P
P
P
P
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N
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N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #13:

score: 10
Accepted
time: 18ms
memory: 3832kb

input:

1000 0.509199 1
P
P
P
P
P
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P
N
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N
P
N
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #14:

score: 10
Accepted
time: 2ms
memory: 3900kb

input:

1000 0.381646 1
P
P
P
P
N
P
N
P
N
P
P
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output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #15:

score: 10
Accepted
time: 3ms
memory: 3824kb

input:

1000 0.42815 1
P
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output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #16:

score: 10
Accepted
time: 12ms
memory: 3820kb

input:

1000 1 1
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output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 1.0 1.0 translate:success

Test #17:

score: 10
Accepted
time: 0ms
memory: 3780kb

input:

1000 0 1
N
N
N
N
N
N
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N
N
C

output:

Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...

result:

points 1.0 1.0 translate:success

Subtask #2:

score: 30.91
Acceptable Answer

Test #18:

score: 50.15
Acceptable Answer
time: 26ms
memory: 3824kb

input:

1000 0.001 300
N
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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: 3776kb

input:

1000 0.005256 300
P
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...

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: 95ms
memory: 4024kb

input:

1000 0.011546 300
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: 31.99
Acceptable Answer
time: 193ms
memory: 3780kb

input:

1000 0.028545 300
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.35544444440 0.3554444444 Output is correct (P=0.028545, F=191.5, Q=278.3) -> 31.99 points

Test #22:

score: 31.6
Acceptable Answer
time: 279ms
memory: 4024kb

input:

1000 0.039856 300
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.35111111110 0.3511111111 Output is correct (P=0.039856, F=246.3, Q=360.1) -> 31.60 points

Test #23:

score: 31.19
Acceptable Answer
time: 443ms
memory: 3948kb

input:

1000 0.068648 300
P
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.34655555560 0.3465555556 Output is correct (P=0.068648, F=366.2, Q=538.8) -> 31.19 points

Test #24:

score: 31.37
Acceptable Answer
time: 553ms
memory: 3764kb

input:

1000 0.104571 300
P
N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.34855555560 0.3485555556 Output is correct (P=0.104571, F=490.3, Q=719.4) -> 31.37 points

Test #25:

score: 31.43
Acceptable Answer
time: 586ms
memory: 3768kb

input:

1000 0.158765 300
P
N
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...

output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.34922222220 0.3492222222 Output is correct (P=0.158765, F=639.1, Q=936.9) -> 31.43 points

Test #26:

score: 30.91
Acceptable Answer
time: 814ms
memory: 3944kb

input:

1000 0.2 300
P
P
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N
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output:

Q 1111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.34344444440 0.3434444444 Output is correct (P=0.2, F=731.4, Q=1081.0) -> 30.91 points