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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#528553 | #9162. COVID tests | Dimash# | 27.33 | 793ms | 4116kb | C++23 | 3.1kb | 2024-08-23 16:13:25 | 2024-08-23 16:13:25 |
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:
// 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);
int col = 0;
function<void(int,int)>go = [&](int l,int r) {
if(l > r) return;
if(l == r) {
col++;
answer[l] = 1;
return;
}
int mid = (l + r) >> 1;
if(as(l,mid)) {
go(l,mid);
}
if(col < 300 && as(mid+1,r)) {
go(mid+1,r);
}
};
if(P > 0.028545) go(0,N-1);
else {
int i = 0;
while(i < N) {
int l = i - 1,r = N;
while(r - l > 1) {
int mid = (l + r) >> 1;
if(as(i,mid)) {
r = mid;
} else {
l = mid;
}
}
if(r < N) {
answer[r] = 1;
i = r + 1;
} else {
break;
}
}
}
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
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Subtask #1:
score: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 3ms
memory: 3824kb
input:
1000 0.789673 1 P 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 N 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 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 N N P P P P P P P P P P P N P P P P P P P P N P N P P P P P N P P P P P P P P P P P P P N P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.0 0.0 translate:wrong
Subtask #2:
score: 27.33
Acceptable Answer
Test #18:
score: 50.15
Acceptable Answer
time: 32ms
memory: 3888kb
input:
1000 0.001 300 N N N N N N N N N N C N P N N P P P N N P N N N N N N N N N C N N P N P N P N P N P P N N N P N P P P N N N P N N N N N N N N C N N N N N N N N N N C N N N N N N N N N N C P N P N P N N N P P N N N N N N N N N N C N N P P P N N N N N N N N N N N N N C N N N N N N N N N N C N N N N N N...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.55722222220 0.5572222222 Output is correct (P=0.001, F=15.1, Q=18.1) -> 50.15 points
Test #19:
score: 72.43
Acceptable Answer
time: 40ms
memory: 3748kb
input:
1000 0.005256 300 P P P N N P P P P P P P P P P P N P N N P N N P P P P N P P N P P N N P N N N N N N P P N N P N N N N N N N C N P P N N P N N P P N P N P P P P N N P N P N N N N N N N N N N N N C N N N P N P N N N P N N N N N N N C P P N P P N N N P N P P N P N N P P N N P P P P P P N P P N P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.80477777780 0.8047777778 Output is correct (P=0.005256, F=51.1, Q=54.2) -> 72.43 points
Test #20:
score: 57.98
Acceptable Answer
time: 87ms
memory: 4116kb
input:
1000 0.011546 300 P P P P P N P P P N P P P P P P N P P N P P N N N P P P N P P P P N P N P N N P P P P P P P P P N P P P P P P P P N P P P P N P N P N P P P P P P P N N P N P N N P N P N N N P P N N N P N N N P P N P P N P N N N N N N N N N N C P P P N N P P N P P P N P P N P N P N N N P N N P P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.64422222220 0.6442222222 Output is correct (P=0.011546, F=94.9, Q=108.0) -> 57.98 points
Test #21:
score: 39.39
Acceptable Answer
time: 208ms
memory: 3944kb
input:
1000 0.028545 300 P P P P P P P P P P P P N P N P P P N P P P P N N N N N P P P P P P P P N P P P P N P N P N P N P P P P P P P N P P P P P N P P P N P P P N P P P P P P P P P P N P P P P P P P P P N P N N N P P P P P N P N 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 N N P P P P P P P N P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.43766666670 0.4376666667 Output is correct (P=0.028545, F=191.5, Q=253.0) -> 39.39 points
Test #22:
score: 27.33
Acceptable Answer
time: 272ms
memory: 3984kb
input:
1000 0.039856 300 P P P P P P N P P P N P N N P N P N P P N P N P P P P P N P N N N N N P P N P P P P P P N N N N P N P P N P P N P P P N N P P P P P N P N P N P P N P P N N P P P N P P N P N P P N N N P P P P P P P P P N N N N P P P P P N N N N P P P P P N P N N N P P P N P P N N N P P P N P P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.30366666670 0.3036666667 Output is correct (P=0.039856, F=246.3, Q=387.5) -> 27.33 points
Test #23:
score: 28.05
Acceptable Answer
time: 440ms
memory: 3760kb
input:
1000 0.068648 300 P P P P P P N P N P N P P N P P P N P P N P N P P P N P P P P N P N P P P P N P P N P N P N P N P P P N P P P N N N P P P N P N P P P N N P P N P P N P N P N P N P P N P N P P P N P N N P P P N P P P P P N N N N N P P N P P N P N P N P N P P P P P N P P P P N N P P P P N P N N N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.31166666670 0.3116666667 Output is correct (P=0.068648, F=366.2, Q=568.4) -> 28.05 points
Test #24:
score: 28.83
Acceptable Answer
time: 508ms
memory: 4020kb
input:
1000 0.104571 300 P P P P P N P P N P P N P N N P P P P N P P N P P P P N N P N P P N P P N P P N P N P P P P N P P P N P N P P N P N P P N P P P P N P P P N N P P P N P P N P N P N P N P N P N P P P P P N P N P N P N P N P P P P P P N N N N P N P N P P N P N P P P P P P P N N P P P N P N P P P N P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.32033333330 0.3203333333 Output is correct (P=0.104571, F=490.3, Q=750.4) -> 28.83 points
Test #25:
score: 29.51
Acceptable Answer
time: 774ms
memory: 4020kb
input:
1000 0.158765 300 P P P P P N P P P P P N N P N P P N N P P P P P P P N N N N P P P P N P N 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 N N P N P P P N P N N P P P P P P N P P N N P N P P N P N P N P N P P P N P N P P P P N P P P N N P P N P N P N N P P P P N P P N P P P P N P P P P N P N ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.32788888890 0.3278888889 Output is correct (P=0.158765, F=639.1, Q=966.6) -> 29.51 points
Test #26:
score: 29.23
Acceptable Answer
time: 793ms
memory: 4056kb
input:
1000 0.2 300 P P P P P P P N P P P N N P P P N P P N P N P N P N P P N P P N P P P P P P P N N P P N P P N P P P N P P N P P P N N P P P P P N P P N P N P P P P N P P N P N P P P P P P N P N N N P P P P P P P P N N P P P P N N P N P P P P P N P N P P N P N P N P P N P P N P P N P P P P P N P N P N P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 0.32477777780 0.3247777778 Output is correct (P=0.2, F=731.4, Q=1111.6) -> 29.23 points