QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#528745 | #9162. COVID tests | Dimash | 76.49 | 569ms | 4100kb | C++23 | 3.3kb | 2024-08-23 20:50:36 | 2024-08-23 20:50:37 |
Judging History
answer
#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
#include <bits/stdc++.h>
using namespace std;;
/// You may use:
string s;
// 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 loc = 0;
bool test_students(std::vector<bool> mask) {
if(loc) {
bool ans = false;
for(int i = 0; i < N; i++) {
if(mask[i] && s[i] == '1') {
ans = 1;
}
}
return ans;
}
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:
mt19937 rng(123321);
// 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.
bool as(int l,int r) {
vector<bool> ask(N,0);
for(int i = l;i <= min(N - 1,r);i++) {
ask[i] = 1;
}
return test_students(ask);
}
std::vector<bool> find_positive() {
vector<bool> answer(N),ask(N,0);
function<void(int,int)>go1 = [&](int l,int r) {
if(l == r) {
answer[l] = 1;
return;
}
int mid = (l + r) >> 1;
if(as(l,mid)) {
go1(l,mid);
}
if(as(mid+1,r)) go1(mid+1,r);
};
function<int(int,int)>go = [&](int l,int r) {
if(l == r) {
answer[l] = 1;
return l;
}
int mid = (r + l + r) / 3;
if(as(l,mid)) {
return go(l,mid);
}
return go(mid+1,r);
};
auto solve = [&](int b) {
int i = 0;
while(i < N) {
int r = min(N - 1,i + b);
if(as(i,r)) {
go1(i,r);
}
i = r + 1;
}
};
if(P == 0) {
return answer;
}
if(P > 0.2){
solve(70);
return answer;
}
int b = (int)(0.5 / P);
int i = 0;
while(i < N) {
int r = min(i + b,N - 1);
if(as(i,r)) {
i = go(i,r)+1;
} else {
i = r + 1;
}
}
return answer;
}
int main() {
int T;
scanf("%d %lf %d", &N, &P, &T);
if(loc) cin >> s;
// You may perform any extra initialization here.
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;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 10
Accepted
Test #1:
score: 10
Accepted
time: 0ms
memory: 4032kb
input:
1000 0.789673 1 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 N 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 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 N 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 N P P P P P P P P P P N P P P P P P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #2:
score: 10
Accepted
time: 7ms
memory: 3804kb
input:
1000 0.686378 1 P P P P P P P N P N N P P P N P N 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 N P P P P P P N P P P P N P N P P P P P P N N 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 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 P P P P P P P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #3:
score: 10
Accepted
time: 6ms
memory: 3744kb
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 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 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 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 N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #4:
score: 10
Accepted
time: 9ms
memory: 3932kb
input:
1000 0.669578 1 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 N P P P P P P N 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 N P P P N P P P N 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 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 N P N P P P P N P N P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #5:
score: 10
Accepted
time: 0ms
memory: 3904kb
input:
1000 0.907052 1 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 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 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 ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #6:
score: 10
Accepted
time: 14ms
memory: 4044kb
input:
1000 0.844418 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 N 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 P P P P N 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 N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #7:
score: 10
Accepted
time: 4ms
memory: 3884kb
input:
1000 0.533576 1 P P P P P P P P P P N P N P P P P P P N P P N P P P N P P P N P P P P P P N N P P N P P P N P P P P P P P N P N 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 P P P P N P P P N 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 N P P P P P P N P P P P P P P P N P P P P N P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #8:
score: 10
Accepted
time: 4ms
memory: 4100kb
input:
1000 0.415944 1 P P P P N P N P P N P P P P N P N P N P P P N P N P P P P P N P N N N P P P N P N P N P P P P P P P P P P P N P P N P P N P N P P P P P N N P P P P P N P P P P P P P P N P P N P N P P P N P P N P P P N P P N P P P P P P N P P N P N P N P P P P N P P P P P P P P N P P P P P N P P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #9:
score: 10
Accepted
time: 3ms
memory: 3884kb
input:
1000 0.596017 1 P P P P P P P P N P P P N P P N P N P P P P P P P P N P P N P P P P P P P P P N P P N P P N P N P P P P N P N P P P N P P P P P P P P P P N P P P N P P P P P P N P P P P P N P P P P P P N P N P P P P P P P P P N P P N P N P P P N P N P P P P P P N P P P P P P P P P P N P N P P N P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #10:
score: 10
Accepted
time: 5ms
memory: 3872kb
input:
1000 0.157686 1 N N N P P P N P N P P P P P P N N P P P P N N P N P N P P P P P P N P P P N N P P P N N N N N P P N N N N P N P P P P N P N P P P P N N P P P N P P P P P P P P P P P P N N N N P P N P P N N P P P N N P P P N N P N N N N P P P P N P P P N P P P N N P P N P P N N N N P P N N N N P P P ...
output:
Q 1111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #11:
score: 10
Accepted
time: 11ms
memory: 3904kb
input:
1000 0.380215 1 P P P P P N P P N P N P P N P P P P N P N N P P P P P N P P P P N P P P P P P N P P P P P N P P N P N P P N P P P P P N P P P P P P P N N P P P N P P P N N P N P P P P P N P N P P P P P P P P N P P N N P P P P P N P N P P P N N P P P P P N P N N P P N P P P P P P P P P P P P P N N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #12:
score: 10
Accepted
time: 5ms
memory: 3800kb
input:
1000 0.432565 1 P P P P P P P P N P N P P P N N P P P P P P P P N P P P P N N P P N P P N P P P P P P P P N P P N 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 N P P N P P N P P P P P P P N P N P P P N P P N P P P P N P P N P P P P N P N P P P P P P P N P N P P N P P N P P P N P P N P P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #13:
score: 10
Accepted
time: 0ms
memory: 3752kb
input:
1000 0.509199 1 P P P P P P P P P N P P N P N P P P P N P P P N P N P P P P P P P N P P P N P P P P P P P P P P P P N N 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 N P P P P N P P N P P N P P P P P P P N P P N P P N P P N P P P P N P P N N P P P P P P P P P N N P P P P P P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #14:
score: 10
Accepted
time: 1ms
memory: 3864kb
input:
1000 0.381646 1 P P P P P N P P N P N P N P P P P P P P N N P N P P N P P P P N P P N P P P N P P N P P N P N P P P P P P P N P N P P P P N N P P P N P N P N P P N P P P P P P N N N P P P P P P N P P P P P P N P P P P P P N P P P P P P P P N P P P P N N P P P P P N N P P P P P N P P P N P P P P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #15:
score: 10
Accepted
time: 0ms
memory: 3852kb
input:
1000 0.42815 1 P P P P P P P N P P P N P P P N P P P P P P P N P N P P P N P N P P P P P P P P N N P P N P P P P P P N P P P P P N P N P P P P P P P N N P N P P P P N N P P P P N P N P N P P P P N P P N P P P N P P N 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 N P N P P P P P P N P P P P P P P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #16:
score: 10
Accepted
time: 2ms
memory: 3800kb
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 1111111111111111111111111111111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Test #17:
score: 10
Accepted
time: 1ms
memory: 4008kb
input:
1000 0 1 C
output:
A 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 translate:success
Subtask #2:
score: 66.49
Acceptable Answer
Test #18:
score: 90
Accepted
time: 9ms
memory: 4008kb
input:
1000 0.001 300 N N C N P P P N P N P N N N C N P P N N N N P N P P P P N P P P N N P P P P N P P N P N C N N C N N C P N P P P P P P P P N P N N C N P P N P N P P N P P N N C N N C N N C P P N P P N P P P N N N N C N N C N P P N N N N P P P P P P N N P P P P N C N P P P N P P P P P P P P P P P P P P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 1.0 1.0 Output is correct (P=0.001, F=15.1, Q=11.6) -> 90.00 points
Test #19:
score: 90
Accepted
time: 48ms
memory: 3752kb
input:
1000 0.005256 300 P N N N P P N P P P P P P N P P P N N N P P N P P N N N N N P P N P P N P P N P N P N P P P P N C N N N N N N P P P N P P P P P P N N P P N P N N N P P N P N P P N N C N N N N N N N N N P P N P N N N N C N P P N N P P P P N P P N P P N P N P P P P P P P P N N N N N N P N P P P N N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 Output is correct (P=0.005256, F=51.1, Q=50.6) -> 90.00 points
Test #20:
score: 78.72
Acceptable Answer
time: 53ms
memory: 3748kb
input:
1000 0.011546 300 P P P N P N P P P P P N N N N N N P N P N P N N P P N 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 N N P N P P P P P N P N N N N N N N N N N N P P N P N N P N N N N N P N N P P P P N P P P P P N N C N N P P P P N P P P N N N N N P N N N P N N N N N N N N N N P P P P N P P ...
output:
Q 1111111111111111111111111111111111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.87466666670 0.8746666667 Output is correct (P=0.011546, F=94.9, Q=98.3) -> 78.72 points
Test #21:
score: 74.32
Acceptable Answer
time: 142ms
memory: 3868kb
input:
1000 0.028545 300 P P P P P P P N N N N P P P N P N N N N P P P P P P N P P P P N P N N N P N N P P P P P N P N P P P N N N N N N N P P P N P P N P P P P P N P N P P N P N P P P P N P P P P N P P P P P P P P P P P N P N P P P P N N N N P P N P P N N N N P N P P P N N N P P N P P N P N P P P P N P P ...
output:
Q 1111111111111111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.82577777780 0.8257777778 Output is correct (P=0.028545, F=191.5, Q=201.6) -> 74.32 points
Test #22:
score: 67.69
Acceptable Answer
time: 258ms
memory: 3908kb
input:
1000 0.039856 300 P N P P P N P P N P P P P P P N N N N N N N N N N P P N P P N P N N P P P P P P N P P P N N P P N P P P P N P N P P P P N N N N P P P P P P P N P P P P P N N P P P P N N P P P P N N P N P P P N N N N N N N N P P N N N N P P P P P P N N N P P N P N N P N N N N P P P N P N P P P N P ...
output:
Q 1111111111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.75211111110 0.7521111111 Output is correct (P=0.039856, F=246.3, Q=266.6) -> 67.69 points
Test #23:
score: 78.06
Acceptable Answer
time: 256ms
memory: 3756kb
input:
1000 0.068648 300 N P N P N P P N P P P N P P P P P P N P P N P P P P P P P P P P N N P P P P P P P N N N N P N P N N P P P P P N P P P P P N N N P P P P N N N P N P P N N N N N N N N P N P P N P P P P P P P P P P P P P P P N P N P P N N P P N P N P P N P N N N P P P N N P P P P P N N N P N N P N P ...
output:
Q 1111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.86733333330 0.8673333333 Output is correct (P=0.068648, F=366.2, Q=380.2) -> 78.06 points
Test #24:
score: 79.72
Acceptable Answer
time: 364ms
memory: 4048kb
input:
1000 0.104571 300 N N N N P P P N N N P P N P P P N P P P P N N N N P P P P P P N N P P P P P P N N P P P N P P N P P P P N P P P N P P P N N N N N N N P N P N N N P P P P N N N P P P N N N N N N P N P P P P N P N P P P N P N P N N P P P P N N P P P P N N N P P P N P P N P P P P P N N N P P P P P N ...
output:
Q 1111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.88577777780 0.8857777778 Output is correct (P=0.104571, F=490.3, Q=506.1) -> 79.72 points
Test #25:
score: 66.49
Acceptable Answer
time: 569ms
memory: 3700kb
input:
1000 0.158765 300 N N N N P P P P N P P P N N N P P P N P P P P N N N N N N N N P N P P P N N N N N P P P N N N N P P P N N N N P N N P N N N P P N N N N P P N P P N N P P P P N P P N N N N N N N P P P P P P P P P P P P N N P P P N N N N N N P N N N P P P N P P N P P P P P P P N P N N P P N P N P P ...
output:
Q 1111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.73877777780 0.7387777778 Output is correct (P=0.158765, F=639.1, Q=695.6) -> 66.49 points
Test #26:
score: 77.57
Acceptable Answer
time: 521ms
memory: 3748kb
input:
1000 0.2 300 N P P N N P P N P P N N N N N N P N P P N P P P N P P N P P N P N P P N N P P P P P N N P P P P P P N P N P N N N N N P N P P P P P P N P N N P N N P P P N P P P N N N N P P N P P N P P P P N N N P P P P P P P P N P N N P N P P N P P N N N N N P P N P P P P P P P N N N P P N N N N P P N...
output:
Q 1110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.86188888890 0.8618888889 Output is correct (P=0.2, F=731.4, Q=760.7) -> 77.57 points