QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#521335 | #9162. COVID tests | Dan4Life# | 32.11 | 1021ms | 4076kb | C++23 | 3.0kb | 2024-08-16 05:59:04 | 2024-08-16 05:59:04 |
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);
vector<int> XD(N,0); iota(all(XD),0); random_shuffle(all(XD));
if(P>0.03){
int likely = P*1000*1.6;
const int B = 10;
for(int i = 0; i < N; i+=B){
if(!likely) break;
for(int j = i; j < min(N,i+B); j++)
test[XD[j]]=1;
if(test_students(test)){
for(int j = i; j < min(N,i+B); j++) test[XD[j]]=0;
for(int j = i; j < min(N,i+B); j++) {
test[XD[j]]=1;
if(test_students(test))
answer[XD[j]]=1, likely--;
test[XD[j]]=0;
}
}
for(int j = i; j < min(N,i+B); j++)
test[XD[j]]=0;
}
return answer;
}
int l = 0;
while(l<N){
for(int i = 0; i < N; i++) test[XD[i]]=0;
for(int i = l; i < N; i++) test[XD[i]]=1;
if(!test_students(test)) return answer;
for(int i = 0; i < N; i++) test[XD[i]]=0;
int r = N-1, oldL = l;
while(l<r){
int mid = (l+r)/2;
for(int i = oldL; i<=mid; i++) test[XD[i]]=1;
if(test_students(test)) r=mid;
else l=mid+1;
for(int i = oldL; i<=mid; i++) test[XD[i]]=0;
}
answer[XD[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
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 10
Accepted
Test #1:
score: 10
Accepted
time: 8ms
memory: 3728kb
input:
1000 0.789673 1 P P P N P P P P N P P P P P N P P P P P P 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 N P P N P P P P P P N P P P 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 N P P N 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 N P P P P P P N P P P P P P P N P P P P P P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #2:
score: 10
Accepted
time: 13ms
memory: 4028kb
input:
1000 0.686378 1 P P P P P P N P N N P P P P N N N N P N P P P N P P N P N P P P P P N P P P P P P P P N P P P P N P P N N P P P P P P P N P N P P P P P P P P P P N N N P P P N P P P N N P P N P P N P P N P N N P P P N P P P P P P P N P P N N P P P P P P N N P N N P P P P P P P P P P N P N N P P P P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #3:
score: 10
Accepted
time: 4ms
memory: 3868kb
input:
1000 0.873862 1 P P P P P P P P P P P P N P P P P P N N P P P P P P P P P P P P P P P P P N 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 P P P P P P P P N P P P P P P P N P P P P N P P P P P N P P P P P P P P P N P P N P N P P P P P P P P P P P P P P P P P P P N P N P N P P P P N P P P P P P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #4:
score: 10
Accepted
time: 0ms
memory: 3776kb
input:
1000 0.669578 1 P N P N N N P N N P N P N N N N P N P N N N P P P P P P P N P P N P P P P P P P P N P P P P P P P P P P P N N P P N P N P P P P P P P P P P P N P N P P P P P P P N P N N N P N P P P P P P P P P N P P N P N N P P P P P P P P P N P P N P P P P P P P N P N P N P N P P P P P P P P N N P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #5:
score: 10
Accepted
time: 2ms
memory: 3772kb
input:
1000 0.907052 1 P P P P P N P P P P P P P P N P P N P P P P P N P P P P P P P P P P N P P P P P P N 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 N N 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 ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #6:
score: 10
Accepted
time: 0ms
memory: 4076kb
input:
1000 0.844418 1 P P P P P P P P N P N 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 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 P P N N P P P P P N P P N P N P P P N P P P P P P P N P P P P N P P N P P P P N P N N N P P N 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 N P P P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #7:
score: 10
Accepted
time: 0ms
memory: 3924kb
input:
1000 0.533576 1 P N P N N N N P P N P P P P N P P P P N P P P N N P P N P N P N P P P P P P N P N N N P P P P N N P P N N P P P N P N P N N P P P P P P N P N P N P P N N P P N N N N N P P P N P P N P N N N P N P P P N P P P P P N N N P P P N P P P N P P N N P P N N P N P N P N P P P N P N N P N P N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #8:
score: 10
Accepted
time: 3ms
memory: 3932kb
input:
1000 0.415944 1 P N N N N P P P P N N P N N N N N N N N N P P N P N P N N P P P N P N N P P P P N P P N P P P N N P P N N N P P N P P N N N P P P P P P N P N N P P N N N P N P P N P N N N P N P P N N P P N P N P N P N N N P P P P N N N P N N P P P N N N N N P N P N P N N N N P N P N P P N P P N N P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #9:
score: 10
Accepted
time: 0ms
memory: 3732kb
input:
1000 0.596017 1 P P P P N N N N P N P P P P P P P P P N N P P N P P N P P P N P N P P P P P N P P P P P P P P P P N N P P P P P N N P P P N P N P N P P P P P N P N N P P P N N P P P P P P N P P N N P N N N N P N N P P N P N N P N P N N P N N N P P P N P P N P P P N N P P P P N P P N P N P P P P N P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #10:
score: 10
Accepted
time: 0ms
memory: 3800kb
input:
1000 0.157686 1 P P N N N N N N N N P N P P N N P N N N N N N P N N N N N N P N N N N P N N N P N N N N N P P N P N P P N N N N N P N N P N N N N P N N P N N N N N N N P N P P P N N N N N N P N N N P N P N N N N N N N P P N N N N P P N N N N P N N P N N N N P N N N N P N N P N N N N N P N P N N P N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #11:
score: 10
Accepted
time: 0ms
memory: 3856kb
input:
1000 0.380215 1 P N N P P P N N N N P P P N N N P N N N N N P N N P P N N N N P N P N P N N N N P N P N P N N N N P P N N P N P P N N N P N N N N P P N N P N P N N N P N P P N P P P N N N N N P P N N N P N N P N N P P N P N P P N N N P P N N P P P N N P N P P N P N N N N P N P P P P N P P N N P N P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #12:
score: 10
Accepted
time: 4ms
memory: 3848kb
input:
1000 0.432565 1 P P P P N P P P N N N P N N N P N N N N N P P N N P P N N N N P N P P N P P P N P P P N P P P P N N P N N P N P N N N P P P N N N N P N N P N N N P P P N P P N P P N N N N N P P N N N N P P N P P N P N P N N N P N N N P P N P N P N N N N N P P P P N N N P P N N N P P N N P N N P P N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #13:
score: 10
Accepted
time: 4ms
memory: 3924kb
input:
1000 0.509199 1 P P N P N P N N P P N P N N P N N P N N N N P P N N N N N N P P P P N P N N P P P P P P P N N P N P N N P N P P P P N P P N N P N N P N P N P P N N P P N P P N P N P P N P P N P N N P N P P N P N N P P N N N P P N P P P P P N P P N P N P P N P P P P P P N N P N P P P P N N N N P N N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #14:
score: 10
Accepted
time: 8ms
memory: 3772kb
input:
1000 0.381646 1 P N P P N P P N N N N P P N N N P P P P N P P N N P P N N P N N N P P N N N P N P P P P P P N P N N N N N N N P N P P N N N N P P P P N P P P P N N N P P P N N N N N P P N P P P P P N N N N P N P N P N N N P N P P N N N P P N P N N N N N P N P N N P P P P N P P P P P P P P N P N N P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #15:
score: 10
Accepted
time: 0ms
memory: 3868kb
input:
1000 0.42815 1 P P P P P N P N N N N P N N N P N N N N P P P P P P P P P N N P N P P N N P N N P N N N P P N P N N P P P N P P N N N N P N P N N N P P P P P P P N P N N P P N P N N N P P N N P P N N P N N P N N P P N N P N N N P N N N P N P P P P N P P P N P N N N N P N P N N N P N N N P P P N N P P...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #16:
score: 10
Accepted
time: 6ms
memory: 3776kb
input:
1000 1 1 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 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 P P P P P P P P P P P P P P P P...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 1.0 1.0 translate:success
Test #17:
score: 10
Accepted
time: 1ms
memory: 3900kb
input:
1000 0 1 N C
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 1.0 1.0 translate:success
Subtask #2:
score: 22.11
Acceptable Answer
Test #18:
score: 90
Accepted
time: 13ms
memory: 3904kb
input:
1000 0.001 300 N C P P P N P N P N P N N N C P P P N P P P N N N N P P P P N P P N N P P P N N N P N P P P P P N C N C N C P P P P N P P P P P N N C P P P N N N P P N N P N C N C N C P P N P N P N N P P P N C N C P N P P N P P P P P N P P P P N N P P P N N C P P N P N N N N P P N P P P N P N P P P P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 1.0 1.0 Output is correct (P=0.001, F=15.1, Q=10.8) -> 90.00 points
Test #19:
score: 78.35
Acceptable Answer
time: 59ms
memory: 3924kb
input:
1000 0.005256 300 P P P P N P P N P P P P P P N P N P N P P N P P P P P P P P N N P P N N N N P P N P P P P N N N N P P N N C P P N P P P N N P P N P P N N P N P N N N P P P P P N N P N N C P N P P P P P P N P N N C P P P N P P P P P P P P P P N P N P N P N P P P N P N N P N N P P P N N P P N P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.87055555560 0.8705555556 Output is correct (P=0.005256, F=51.1, Q=53.0) -> 78.35 points
Test #20:
score: 49.17
Acceptable Answer
time: 109ms
memory: 4056kb
input:
1000 0.011546 300 P P P P N P P P N N N P P P P N P N P N N P P P P P N P P N N P P P P P P N P N P P P P P P N P N N N P N P P 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 N N P P N P P P P P N N N P N P P P P P N P N N N P P P P P N P N P P P P P P P N N P P P P P N C P P P P P N P N P N P P ...
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: 31.59
Acceptable Answer
time: 365ms
memory: 3728kb
input:
1000 0.028545 300 P P P P P P P N N N N P P P P P P P P N N P P P P P P N P N P P N P P P P P P P P N N N P P P P P P P N P N P P P P P N P P N N P N P P P P P P P P N N P P P P P P P N P N N P P P P N P P P P N P P P P P P P N P P P P P P P P N P P N P P N P P P P P N P P P P N P P P P P N P P P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.3510 0.351 Output is correct (P=0.028545, F=191.5, Q=280.0) -> 31.59 points
Test #22:
score: 22.11
Acceptable Answer
time: 302ms
memory: 3924kb
input:
1000 0.039856 300 N N P N N N N N N N N P N N N N P N N N N N N N P N N N P N N N N N N N N P N P N N N N P P N N N N N P N N N N N N N P N N P N N N P N N N N N N N N P N N P N P N N N N N N P N P N N P N N N N N N P N N N N N N N P N N P N P N N N N N N N N N P N N N N N P N N N N N P N N N P N N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 0.24566666670 0.2456666667 Output is correct (P=0.039856, F=246.3, Q=435.4) -> 22.11 points
Test #23:
score: 24.44
Acceptable Answer
time: 420ms
memory: 3872kb
input:
1000 0.068648 300 P N N N N N N N P N N N P N N N P N N N N N N P N P N N P N N N N N P N N N P N N N N N N N P N N P N N N N N N N P N N N N N P N N N N P N N N N P N N N N N N N P N N N N N N N N N P N N P N N N N N N N P N N N N P P N N N N N N N N N N P N N N N P N N N N N N N N P N N N N N N N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 0.27155555560 0.2715555556 Output is correct (P=0.068648, F=366.2, Q=611.8) -> 24.44 points
Test #24:
score: 27.24
Acceptable Answer
time: 582ms
memory: 3932kb
input:
1000 0.104571 300 P N N N N N N N N N P P N N N N N N N P N N P N P N N N P N N P N P N N N N N N N P N P P N N N N N N N P N N N N N P N N N N P N N N N N P P N N N P N N N N N N P N N P N N P N N P N N P N P N N N N N N N N N P N N P N P N N N N N P N N N N N N N P N P P N N N N N N N N P N N P P ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 0.30266666670 0.3026666667 Output is correct (P=0.104571, F=490.3, Q=772.7) -> 27.24 points
Test #25:
score: 32.4
Acceptable Answer
time: 678ms
memory: 3776kb
input:
1000 0.158765 300 P N N N P N N N N N N P P N N N N N N N N N N P N P N P P N P N N P N N P N P N N N N N P P N P N N N N N P N N N P P N N P N N N N N N N N P N N N P P N N N N N N P N N N P N N N N N N P N P N N N N N N N N N P N N N N N P P P N N P N N P P N P N N N N P P N N N N N P N P N P N N ...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 0.360 0.36 Output is correct (P=0.158765, F=639.1, Q=923.1) -> 32.40 points
Test #26:
score: 37.16
Acceptable Answer
time: 1021ms
memory: 3904kb
input:
1000 0.2 300 P N N N N P P N P N N P N N P N P N N P N P N P N P N N N N N P N N P N P N N P N N N P P P N N N N N N N N N P P N N N N N N N N N P N P P N N N N P N P N N P P N N N N P N N N N P N N N N N P N N N N P N P P N N N P N N N P N P N P N N N N N N P N P P N N P N N N N P N P N N N N N N N...
output:
Q 0000000000000000000000000000000000000000000000000000000000000000000001000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000...
result:
points 0.41288888890 0.4128888889 Output is correct (P=0.2, F=731.4, Q=991.4) -> 37.16 points