QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#521798#9162. COVID testsDan4Life0 661ms4120kbC++232.6kb2024-08-16 15:08:532024-08-16 15:08:53

Judging History

你现在查看的是最新测评结果

  • [2024-08-16 15:08:53]
  • 评测
  • 测评结果:0
  • 用时:661ms
  • 内存:4120kb
  • [2024-08-16 15:08:53]
  • 提交

answer

#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);
    vector<int> XD(N,0); iota(all(XD),0); random_shuffle(all(XD));
    double prob = 1.0-P;
    int B = 1;
    while(prob<0.5) prob*=(1.0-P), B++;
    for(int i = 0; i < N; i+=B){
		int l = i, r = min(N,i+B);
		for(int j = l; j < r; j++) test[XD[j]]=1;
		if(!test_students(test)) continue; 
		while(l<min(N,i+B)){
			r = min(N,i+B);
			while(l<r){
				int mid = (l+r)/2;
				for(int j = l; j <= mid; j++) test[XD[j]]=1;
				if(test_students(test)){
					r=mid;
					for(int j = l; j <= mid; j++) test[XD[j]]=0;
				}
				else l=mid+1;
			}
			answer[XD[l]]=1; l++;
		}
		for(int j = i; j < min(N,i+B); j++) test[XD[j]]=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++) {
        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;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Time Limit Exceeded

Test #1:

score: 0
Time Limit Exceeded

input:

1000 0.789673 1

output:


result:


Subtask #2:

score: 0
Wrong Answer

Test #18:

score: 0
Wrong Answer
time: 661ms
memory: 4120kb

input:

1000 0.001 300
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N
N...

output:

Q 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...

result:

points 0.0 0.0 translate:wrong