QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#578740 | #9162. COVID tests | liuziao | 10 | 1000ms | 15848kb | C++23 | 2.7kb | 2024-09-20 21:04:15 | 2024-09-20 21:04:17 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=(a);i<=(b);++i)
#define per(i,a,b) for(int i=(a);i>=(b);--i)
/// You may use:
// The number of students
int N;
// 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';
}
/// 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.
typedef double ld;
const ld INF=1e9;
ld dp[1009][1009],pb[1009];
int trans[1009][1009];
mt19937 rnd(time(0));
std::vector<bool> find_positive(bool typ) {
std::vector<bool> answer(N);
for (int i = 0; i < N; ++i) {
std::vector<bool> vec(N);
vec[i] = 1;
if (test_students(vec)) answer[i] = 1;
}
return answer;
}
int main() {
int T;
scanf("%d %lf %d", &N, &P, &T);
if(T>1){
pb[0]=1;
rep(i,1,N)pb[i]=pb[i-1]*(1-P);
rep(i,0,N+1){
rep(j,0,N+1)dp[i][j]=INF;
}
rep(i,0,N+1)dp[0][i]=0;
rep(i,1,N){
dp[i][1]=dp[i-1][0];
rep(j,2,i){
rep(k,1,j){
ld prob=(pb[k]-pb[j])/(1-pb[j]);
ld val=dp[i-k][j-k]*prob+dp[i][k]*(1-prob)+1;
if(val<dp[i][j])dp[i][j]=val,trans[i][j]=k;
}
}
rep(j,1,i){
ld val=dp[i-j][0]*pb[j]+dp[i][j]*(1-pb[j])+1;
if(val<dp[i][0])dp[i][0]=val,trans[i][0]=j;
}
}
}
// You may perform any extra initialization here.
for (int i = 0; i < T; i++) {
std::vector<bool> answer = find_positive(T==1);
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;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 10
Accepted
Test #1:
score: 10
Accepted
time: 6ms
memory: 3996kb
input:
1000 0.789673 1 P N P P P P P P N P P N P N P P P P P N 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 N N N P P P P N P P P P N N P P P N P P P P N P P P P P N N P N P P P P P N P P P P P P P P P P P P P P P P P P N N P N P P P P P P P P N P N P P P N N P P P P P P P P P P P P P P P P P P P P N ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #2:
score: 10
Accepted
time: 5ms
memory: 3788kb
input:
1000 0.686378 1 N P N N N P N N P N P P N N P P P P N P P P N P P P N N P N P P P N N N P N P P P N P P P P P P N N P P P N P P P P P P P P P P P P P P P P P P N N P P N N N P P N P N P P P P P N P N N P P P N P N N P N P P P P N P N P P P P N P P N P P P N P N P P N P N N P P N P N P P N N P N N P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #3:
score: 10
Accepted
time: 0ms
memory: 3992kb
input:
1000 0.873862 1 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 N P P P P P P P P P N P 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 N P P N P P P P P P N 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 N P P P P P N P P N P P P P P P P P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #4:
score: 10
Accepted
time: 3ms
memory: 4116kb
input:
1000 0.669578 1 P P N P P P P P N P N P P P N P P P P P P P N P P P P N N P N P N P P N P P N P P N P N P P P P P P P P P P P P P N N P P N P P N N P P N N P N P N P N P P N N P P P P P P P P P P N P P N P P N P P P P P P N P P P P N N N P N P P N P P N N P P N P P P N P P N P P P P P N P P N P P P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #5:
score: 10
Accepted
time: 1ms
memory: 4136kb
input:
1000 0.907052 1 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 N 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 P P P P P P P P P P P P P N 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 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 N P P P P N N P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #6:
score: 10
Accepted
time: 0ms
memory: 3836kb
input:
1000 0.844418 1 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 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 N P P P N P P P P P N P P P P P P N P P P N P N P P N P P P N P P N P P P N N N P P P P N N P N N P P P P P P P N 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 ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #7:
score: 10
Accepted
time: 6ms
memory: 3792kb
input:
1000 0.533576 1 P P P N N N N P P N N P N P N P P N P N N P N P N P P N P N P N P P P P N N N P P P P P N N P P N P P P P P N P P P P N N N N N P N P P P N P N P P P N P P P P N P N P P N N P N N P N P P N N P N P P N N P N N P N N P P N N N N P N P N N P N N P P N P P P P P N N N P P N P N P N P P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #8:
score: 10
Accepted
time: 2ms
memory: 3964kb
input:
1000 0.415944 1 N N N N N N N P N N P N N P N P N N N P N N N N N N N N N P N N N N P P P P N P N N P N N P N N P P N P P P N N P N P N N N N N P N P N P N P N N N P N N N N P N N P P P P P N N N P P N N N P N N P N P P P N P P N P P P N P N P P P P P N N N P P P P P P P P N N N P P N N N N N N P P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #9:
score: 10
Accepted
time: 0ms
memory: 4124kb
input:
1000 0.596017 1 P N P P N N P N N P P P N P N N P P P N P N P N N N P N N P N N P N P P P N P P N P P P N P N P P P N P N N P P P N P N N N P N N N P P P N P P P N N P N N P P N N P N P N N P N N P N P P N N P P P P N P P P N N P P P P P P N P P P N P P N P P P P P P P P N P P P P N N P P P N P N P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #10:
score: 10
Accepted
time: 0ms
memory: 3836kb
input:
1000 0.157686 1 N N N N N N N N N N N N N P N N N P P N N P N N N N P N N N N N N N N N N N P N N N P P N N P N P N N N N N P N N N N N N N N N N N N N N N N N N P N N N N N N N N N N N N N N N P P N N N N N N N P P N N N N N N N N N P P P P N N N N N N N N N N N N N N N N N N P N N P N N N N N P N ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #11:
score: 10
Accepted
time: 0ms
memory: 3964kb
input:
1000 0.380215 1 N N N P N N N P N N P N N N P P N P N N N P P P N P P N N N P N N N P N N N P P P P N N N N N P P N N N N N N N N N N N N N N P P N N N N P P N N N P N N N N N P N P N N P N N N N P N N N N P P P P P P P N N N N N N N N N N P N N P N N N P N N N N N N N N N P N P N P N N P P N N P P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #12:
score: 10
Accepted
time: 5ms
memory: 3992kb
input:
1000 0.432565 1 P N P N N P N N N P P P N P P N N N N N N N N N P P P N P P N N P P P P N P P N N N N P P P P N P N N P P P N N N N P N P N P N P N P P N N P N N P N N N P N P N N N P N N P N P N N N P N N P P P P P P N P N N N N N N N P P N P N N N N P P P N P N N P P P N P P P P P P N P N P P N P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #13:
score: 10
Accepted
time: 7ms
memory: 3792kb
input:
1000 0.509199 1 P P N P N N N P P N N N N N P N N P P N P P N P P P P P N N P N P P N P P P P P P P P P P N P P P N N P N P P N P N P N N P N P N P N N N N N P P N N N P P P N N P P P P N N N N P P N P N N N P P P P P N N N P P N P P N P N P P P N N P P N N N N N N P P P N N P P N N N N N N P P N N ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #14:
score: 10
Accepted
time: 0ms
memory: 3836kb
input:
1000 0.381646 1 N N N P N N N N P P P N N N N N P N N N P N P N P N P N N N N N N N P P N N N N P P N N N N N P N N N N P N P N N N N P P P N P P N P P P N P N P P P N N N N N P N N P P N P P N P P N N N N P P N N P N N N N N P N N P P N N N N N P P N P N N P N N N P P N N P N N N N P P N N N N N P ...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #15:
score: 10
Accepted
time: 5ms
memory: 4092kb
input:
1000 0.42815 1 N P P N P N P P P N N P N N P N N P P P N N N N P P P N N N P P N P N N P N N N P P N N N N P N N P P N P N N N N P N N N N N P N P P N P P P P N N N P P P N P P P N P P N P N N N P N N P N N P P N P P N N P N N P P P P P P P N N N P N P N P N N N N N N N P N N N P N P P P P N N N P N...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #16:
score: 10
Accepted
time: 6ms
memory: 4068kb
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 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #17:
score: 10
Accepted
time: 4ms
memory: 3992kb
input:
1000 0 1 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 N N N...
output:
Q 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Subtask #2:
score: 0
Wrong Answer
Test #18:
score: 0
Wrong Answer
time: 1000ms
memory: 15848kb
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 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.0 0.0 translate:wrong