oj.uz

Submission #1060721

# Submission time Handle Problem Language Result Execution time Memory
1060721 2024-08-15T21:13:33 Z Dan4Life COVID tests (CEOI24_covid) C++17
0 / 100
 4138 ms 596 KB 
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a), end(a)
using ll = long long;
using vi = vector<int>;
using ar2 = array<int,2>;
using ar3 = array<int,3>;
using ar4 = array<int,4>;
const int INF = (int)2e9;
const int mxN = (int)1e6+10;

int N;
double P;
map<vector<bool>,bool> M;
// 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);
	//if(M.count(mask)) return M[mask];
    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<bool> find_positive() {
    vector<bool> answer(N,false), test(N,false);
	int l = 0;
	while(l<N){
		for(int i = 0; i < N; i++) test[i]=0;
		for(int i = l; i < N; i++) test[i]=1;
		if(!test_students(test)) return answer;
		for(int i = 0; i < N; i++) test[i]=0;
		int r = N-1, oldL = l;
		while(l<r){
			int mid = (l+r)/2;
			for(int i = oldL; i<=mid; i++) test[i]=1;
			if(test_students(test)) r=mid;
			else l=mid+1;
			for(int i = oldL; i<=mid; i++) test[i]=0;
		}
		answer[l]=1; l++;
	}
    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++) {
        vector<bool> answer = find_positive();
        assert(answer.size() == (size_t)N);

        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:32:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:65:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:81:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct

Subtask #1
0.0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 59 ms 344 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0.0 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 344 KB Output is correct (P=0.001, F=15.1, Q=10.7) -> 90.00 points
2 Correct 132 ms 344 KB Output is correct (P=0.005256, F=51.1, Q=52.9) -> 78.89 points
3 Correct 274 ms 344 KB Output is correct (P=0.011546, F=94.9, Q=114.6) -> 49.17 points
4 Correct 651 ms 344 KB Output is correct (P=0.028545, F=191.5, Q=279.4) -> 31.73 points
5 Correct 1027 ms 344 KB Output is correct (P=0.039856, F=246.3, Q=392.4) -> 26.68 points
6 Correct 1677 ms 344 KB Output is correct (P=0.068648, F=366.2, Q=673.2) -> 20.67 points
7 Correct 2471 ms 596 KB Output is correct (P=0.104571, F=490.3, Q=1023.8) -> 16.81 points
8 Correct 3743 ms 344 KB Output is correct (P=0.158765, F=639.1, Q=1540.6) -> 13.55 points
9 Execution timed out 4138 ms 344 KB Time limit exceeded (wall clock)
10 Halted 0 ms 0 KB -