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Submission #1044492

# Submission time Handle Problem Language Result Execution time Memory
1044492 2024-08-05T10:10:40 Z VahanAbraham COVID tests (CEOI24_covid) C++17
37.7 / 100
 2960 ms 600 KB 
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <sstream>
#include <map>
#include <stack>
#include <set>
#include <queue>
#include <list>
#include <unordered_set>
#include <unordered_map>
#include <math.h>
#include <bitset>
#include <cmath>
#include <vector>
#include <iomanip>
#include <random>
#include <chrono>
#include <cassert>
#include <cassert>
#include <cstdio>
#include <string>
#include <vector>

/// You may use:

using namespace std;


// The number of students
int N;

#define ll long long
#define fr first
#define sc second
#define pb push_back

// 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';
}

int ans[10000];

void rec(int l, int r) {
    vector<bool> v;
    v.resize(N);
    for (int i = 0; i < N; ++i) {
        if (i >= l && i <= r) {
            v[i] = 1;
        }
        else {
            v[i] = 0;
        }
    }
    if (l == r) {
        if (test_students(v) == 0) {
            for (int i = l; i <= r; ++i) {
                ans[i] = -1;
            }
            return;
        }
        return;
    }
    if (test_students(v) == 0) {
        for (int i = l; i <= r; ++i) {
            ans[i] = -1;
        }
        return;
    }
    else {
        int mid = (l + r) / 2;
        rec(l, mid);
        rec(mid + 1, r);
    }
}
/// 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> find_positive() {
    std::vector<bool> answer(N);
    for (int i = 0; i < N;i+=100) {
        rec(i, i + 99);
    }
    for (int i = 0; i < N; ++i) {
        if (ans[i] == -1) {
            answer[i] = 0;
        }
        else {
            answer[i] = 1;
        }
    }
    for (int i = 0; i < N; ++i) {
        ans[i] = 0;
    }
    return answer;
}

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

    // 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;
}

Compilation message

Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:59:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:124:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  124 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:140:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  140 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 440 KB Output is correct
2 Correct 12 ms 448 KB Output is correct
3 Correct 11 ms 440 KB Output is correct
4 Correct 11 ms 344 KB Output is correct
5 Correct 14 ms 440 KB Output is correct
6 Correct 11 ms 344 KB Output is correct
7 Correct 10 ms 344 KB Output is correct
8 Correct 13 ms 444 KB Output is correct
9 Correct 13 ms 344 KB Output is correct
10 Correct 9 ms 344 KB Output is correct
11 Correct 9 ms 344 KB Output is correct
12 Correct 9 ms 436 KB Output is correct
13 Correct 17 ms 344 KB Output is correct
14 Correct 12 ms 436 KB Output is correct
15 Correct 10 ms 344 KB Output is correct
16 Correct 20 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct

Subtask #2
27.700000002 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 49 ms 344 KB Output is correct (P=0.001, F=15.1, Q=22.2) -> 31.24 points
2 Correct 161 ms 344 KB Output is correct (P=0.005256, F=51.1, Q=74.1) -> 32.14 points
3 Correct 355 ms 344 KB Output is correct (P=0.011546, F=94.9, Q=143.0) -> 29.73 points
4 Correct 665 ms 344 KB Output is correct (P=0.028545, F=191.5, Q=298.3) -> 27.86 points
5 Correct 938 ms 344 KB Output is correct (P=0.039856, F=246.3, Q=384.8) -> 27.70 points
6 Correct 1334 ms 344 KB Output is correct (P=0.068648, F=366.2, Q=568.5) -> 28.04 points
7 Correct 1907 ms 344 KB Output is correct (P=0.104571, F=490.3, Q=753.3) -> 28.61 points
8 Correct 2516 ms 344 KB Output is correct (P=0.158765, F=639.1, Q=974.4) -> 29.05 points
9 Correct 2960 ms 600 KB Output is correct (P=0.2, F=731.4, Q=1121.4) -> 28.73 points