#include <bits/stdc++.h>
/// You may use:
// The number of students
int N,T;
// 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.
std::vector<bool> answer;
std::vector<bool> test;
std::vector<int> ind;
int p[5010];
std::vector<int>ns;
void calculeaza(int b,int e)
{
if(b>e)
return;
int ce=e;
b=0;
while(b+1!=e)
{
int mid=(b+e)/2;
for(int i=b+1;i<=mid;++i)
test[p[i]]=1;
bool r=test_students(test);
for(int i=b+1;i<=mid;++i)
test[p[i]]=0;
if(r==false)
b=mid;
else
e=mid;
}
answer[p[e]]=1;
std::reverse(ns.begin(),ns.end());
for(int i=e+1;i<=ce;++i)
ns.push_back(p[i]);
std::reverse(ns.begin(),ns.end());
}
void raspunde(int sz,int sz2)
{
for(int i=0;i<N;++i)
ns.push_back(ind[i]);
while(ns.size())
{
int x=ns.size();
if(rand()%2==1)
x=std::min(x,sz);
else
x=std::min(x,sz2);
p[0]=0;
while(x--)
{
p[++p[0]]=ns.back();
ns.pop_back();
}
for(int i=1;i<=p[0];++i)
test[p[i]]=1;
bool r=test_students(test);
for(int i=1;i<=p[0];++i)
test[p[i]]=0;
if(r==true)
calculeaza(1,p[0]);
}
}
std::vector<bool> find_positive()
{
for(int i=0;i<N;++i)
{
answer[i]=test[i]=0;
ind[i]=i;
}
random_shuffle(ind.begin(),ind.end());
if(T==1)//subtask 1
{
raspunde(1,1);
}
else if(P>0.17)///P=0.2
{
raspunde(3,3);
}
else if(P>0.11)///P=0.158765
{
raspunde(4,4);
}
else if(P>0.1)//P=0.104571
{
raspunde(7,7);
}
else if(P>0.06)///P=0.068648
{
raspunde(8,8);
}
else if(P>0.03)///P=0.039856
{
raspunde(15,15);
}
else if(P>0.02)///P=0.028545
{
raspunde(24,24);
}
else if(P>0.01)///P=0.011546
{
raspunde(58,58);
}
else if(P>0.005)///P=0.005256
{
raspunde(200,200);
}
else///P=0.001
{
raspunde(500,500);
}
return answer;
}
int main() {
scanf("%d %lf %d", &N, &P, &T);
// You may perform any extra initialization here.
srand(time(0));
answer.resize(N);
ind.resize(N);
test.resize(N);
for (int i = 0; i < T; i++) {
std::vector<bool> answer = find_positive();
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;
}
Compilation message
Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:25:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
25 | scanf(" %c", &answer);
| ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:143:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
143 | scanf("%d %lf %d", &N, &P, &T);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:162:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
162 | scanf(" %c", &verdict);
| ~~~~~^~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
6 ms |
344 KB |
Output is correct |
| 2 |
Correct |
6 ms |
344 KB |
Output is correct |
| 3 |
Correct |
6 ms |
344 KB |
Output is correct |
| 4 |
Correct |
6 ms |
344 KB |
Output is correct |
| 5 |
Correct |
6 ms |
344 KB |
Output is correct |
| 6 |
Correct |
6 ms |
344 KB |
Output is correct |
| 7 |
Correct |
11 ms |
344 KB |
Output is correct |
| 8 |
Correct |
8 ms |
344 KB |
Output is correct |
| 9 |
Correct |
7 ms |
344 KB |
Output is correct |
| 10 |
Correct |
6 ms |
344 KB |
Output is correct |
| 11 |
Correct |
6 ms |
344 KB |
Output is correct |
| 12 |
Correct |
7 ms |
344 KB |
Output is correct |
| 13 |
Correct |
6 ms |
344 KB |
Output is correct |
| 14 |
Correct |
5 ms |
344 KB |
Output is correct |
| 15 |
Correct |
6 ms |
344 KB |
Output is correct |
| 16 |
Correct |
6 ms |
344 KB |
Output is correct |
| 17 |
Correct |
6 ms |
344 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
34 ms |
344 KB |
Output is correct (P=0.001, F=15.1, Q=10.9) -> 90.00 points |
| 2 |
Correct |
111 ms |
344 KB |
Output is correct (P=0.005256, F=51.1, Q=47.4) -> 90.00 points |
| 3 |
Correct |
232 ms |
344 KB |
Output is correct (P=0.011546, F=94.9, Q=90.9) -> 90.00 points |
| 4 |
Correct |
505 ms |
344 KB |
Output is correct (P=0.028545, F=191.5, Q=189.6) -> 90.00 points |
| 5 |
Correct |
611 ms |
344 KB |
Output is correct (P=0.039856, F=246.3, Q=244.4) -> 90.00 points |
| 6 |
Correct |
1040 ms |
344 KB |
Output is correct (P=0.068648, F=366.2, Q=365.8) -> 90.00 points |
| 7 |
Correct |
1347 ms |
344 KB |
Output is correct (P=0.104571, F=490.3, Q=488.9) -> 90.00 points |
| 8 |
Correct |
1651 ms |
344 KB |
Output is correct (P=0.158765, F=639.1, Q=632.8) -> 90.00 points |
| 9 |
Correct |
1892 ms |
344 KB |
Output is correct (P=0.2, F=731.4, Q=729.5) -> 90.00 points |
