QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#521326 | #9162. COVID tests | Dan4Life# | 0 | 1835ms | 4112kb | C++23 | 2.4kb | 2024-08-16 05:08:07 | 2024-08-16 05:08:07 |
Judging History
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);
int l = 0; M.clear();
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;
int r = N-1, oldL = l;
while(l<r){
int mid = (l+r)/2;
for(int i = 0; i < N; i++) test[i]=0;
for(int i = oldL; i<=mid; i++) test[i]=1;
if(test_students(test)) r=mid;
else l=mid+1;
}
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;
}
Details
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 41ms
memory: 3800kb
input:
1000 0.789673 1 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 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 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 P P P P P P P N 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 P P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.0 0.0 translate:wrong
Subtask #2:
score: 0
Time Limit Exceeded
Test #18:
score: 90
Accepted
time: 13ms
memory: 3832kb
input:
1000 0.001 300 N C P N P N N P P P N P P N C P N N P N P N P P N N P P P N N N P P P P P P N N N P P N C N C N C P P N P N P N N P N P N C P N N P P P N N N N P N C N C N C P P N P P P P N P N P N C N C P N N P N P N P P P N P P N N P P N P P N C P N P N P P N N P P P P P P N N P P P N P N P P P P P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 1.0 1.0 Output is correct (P=0.001, F=15.1, Q=10.7) -> 90.00 points
Test #19:
score: 78.89
Acceptable Answer
time: 70ms
memory: 3824kb
input:
1000 0.005256 300 P P P P N P N N N N P P P P P P P N P P N P P N N P P P P P N N P N P P N N P N P N P N N P P N P N N N C P N P P N N P N P N N P N P N P P P P P N P P N P N N N P N C P N N N P N P N N P N N C P P P N P P N N N P P P P P N P N N P P P P P P P P P P P P N N P N P N P N P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.87655555560 0.8765555556 Output is correct (P=0.005256, F=51.1, Q=52.9) -> 78.89 points
Test #20:
score: 49.17
Acceptable Answer
time: 171ms
memory: 4112kb
input:
1000 0.011546 300 P P P P P P N P P P P P P P P P P P N P P P P P P N N P N N N N P P P P N P N P N P P P P P P P P P P P P N P P P P P P P P P P N P P P P P N P P N N P P P P P P P N P P N P N P N N P N P N P P P P N N N P P N P N P P N P P P P P P N N N N N C P P P P N N P P P N N P P N P P N P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.54633333330 0.5463333333 Output is correct (P=0.011546, F=94.9, Q=114.6) -> 49.17 points
Test #21:
score: 31.73
Acceptable Answer
time: 445ms
memory: 3940kb
input:
1000 0.028545 300 P P P P P P P P P P P P P P P N P P N N N N P P P P P N N N N P P P P P P P P P P P N N P P P P N P N P P N P P P P P P P P P P N N P P P P P N P P P P P P P P N P P P P P P P P P P P P P N N N N P P P P P P N P N P P P P P P P N P P N P P P P P N P P P P N P P P P P P P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.35255555560 0.3525555556 Output is correct (P=0.028545, F=191.5, Q=279.4) -> 31.73 points
Test #22:
score: 26.68
Acceptable Answer
time: 535ms
memory: 4088kb
input:
1000 0.039856 300 P P P P P P P N P P N P P P P P P N P P N N P P P P P P P P P N N P P P N P P P P P N P P P P P P P N N N P N P P P P P P P P P P N P P P P P P P P N P N P P P P P P P P N N P P P P P P P N P P P P P P P P P P P P N N P P P P P N N P P P N P P P P P P N P N P P P P P P P P N P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.29644444440 0.2964444444 Output is correct (P=0.039856, F=246.3, Q=392.4) -> 26.68 points
Test #23:
score: 20.67
Acceptable Answer
time: 815ms
memory: 4080kb
input:
1000 0.068648 300 P P P P P P P N N N P P P P P P P P P P N N P P P P P P P P P N N P P P P P P P P P P P P P P P P P P N P N N 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 N P P P P P P P P P P P N P P P P P P P P N P N N N P P P P P P P N P P P P P P P P P P N P P P P P P P P P N N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.22966666670 0.2296666667 Output is correct (P=0.068648, F=366.2, Q=673.2) -> 20.67 points
Test #24:
score: 16.81
Acceptable Answer
time: 1255ms
memory: 4112kb
input:
1000 0.104571 300 P P P P P P N P N P N P P P P P P P N N 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 P P P N P N P P P P P P P P P P P N P P P P P P P P P N P N P P P P P P P P P N P P P P P P P P P N N 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 P P P P P P N N P P P P P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.18677777780 0.1867777778 Output is correct (P=0.104571, F=490.3, Q=1023.8) -> 16.81 points
Test #25:
score: 13.55
Acceptable Answer
time: 1835ms
memory: 3772kb
input:
1000 0.158765 300 P P P P P P N P P P P P P P P P P P P N P N 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 N P P N P P P P P P P P P P P P N P P P P P P N P P N P P P P P P P P N N P N P P P P P P N P P P N P P P P P P P N P P P P P P P P P P N P N N P P P P P P N P P P P P P P P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.15055555560 0.1505555556 Output is correct (P=0.158765, F=639.1, Q=1540.6) -> 13.55 points
Test #26:
score: 0
Time Limit Exceeded
input:
1000 0.2 300 P P P P P P P P N P P P P P P P P P P N P P P P P P P P P P P P N P P P P P P N P P P N 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 P P P P P N P P P P P P P P P P P P N P P P P P P P P P N P P P P P P P P P P P N P P P P P P P P P N N P P P P P P P P P P N P P P P P P P P P N N P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...