#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
using namespace std;
/// 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(vector<bool> mask) {
assert(mask.size() == (size_t)N);
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> answer;
int next_poz;
bool sem;
bool divide(int st,int dr,bool keep)
{
if(sem==true)
return 0;
if(st==dr)
{
vector<bool> ask(N,0);
if(keep==false)
{
ask[st]=1;
answer[st]=test_students(ask);
}
else
{
answer[st]=1;
}
if(answer[st]==1)
{
next_poz=st+1;
sem=true;
}
return answer[st];
}
if(keep==false)
{
vector<bool> ask(N,0);
for(int i=st;i<=dr;i++)
{
ask[i]=1;
}
bool rasp=test_students(ask);
if(rasp==0)
{
return 0;
}
}
int mijl=(st+dr)/2;
bool pozitiv=divide(st,mijl,false);
if(pozitiv==0)
keep=true;
else
keep=false;
if(sem==true)
return 0;
divide(mijl+1,dr,keep);
return 1;
}
vector<bool> find_positive()
{
int block_size=1.0*(0.5/P),i;
answer=vector<bool>(N,0);
if (P == 0) return answer;
if (P >= 1.0) {
for (int i = 0; i < N; ++i) answer[i] = 1;
return answer;
}
i=0;
while(i<N)
{
next_poz=i+block_size+1;
sem=false;
divide(i,min(i+block_size,N-1),false);
i=next_poz;
}
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;
}
Compilation message (stderr)
Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:31:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
31 | scanf(" %c", &answer);
| ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:113:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
113 | scanf("%d %lf %d", &N, &P, &T);
| ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:129:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
129 | scanf(" %c", &verdict);
| ~~~~~^~~~~~~~~~~~~~~~~
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