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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#528701 | #9162. COVID tests | Dimash | 76.25 | 593ms | 4048kb | C++23 | 3.2kb | 2024-08-23 20:01:27 | 2024-08-23 20:01:28 |
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<int(int,int)>go = [&](int l,int r) {
if(l == r) {
answer[l] = 1;
return l;
}
int mid = (l + r) >> 1;
if(as(l,mid)) {
return go(l,mid);
}
return go(mid+1,r);
};
function<void(int,int,int)>solve = [&](int l,int r,int b){
int i = l;
while(i < r) {
int r = min(N - 1,i + b);
if(as(i,r)) {
// cout << i << ' ' << r << '\n';
if(b == 31) {
solve(i,r,7);
} else {
go(i,r);
}
}
i = r + 1;
}
};
if(P > 0.2){
solve(0,N-1,170);
return answer;
}
int b = 0.5 / P + 1;
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: 0
Wrong Answer
Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 3744kb
input:
1000 0.789673 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 W
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.0 0.0 translate:wrong
Subtask #2:
score: 76.25
Acceptable Answer
Test #18:
score: 90
Accepted
time: 7ms
memory: 3752kb
input:
1000 0.001 300 N N C N P P N N P P P P N N N C N P N P N P N P P N P P P P N N N P P P P P P N N N P P N C N N C N N C P N P N P N N P P N N N C N P N P P P N N N P N N C N N C N N C P N P P P P N P P N N N C N N C N P N P N P N P P P P P P N N P P N P P N C N P P N P P N P N N P P P P N N P P P N P...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111...
result:
points 1.0 1.0 Output is correct (P=0.001, F=15.1, Q=10.9) -> 90.00 points
Test #19:
score: 90
Accepted
time: 35ms
memory: 3808kb
input:
1000 0.005256 300 P N N N N P N P P P P N P N N N N P P N N N N N N N N P P N N N N P P N P N N P P N P N N C N N N N N N P P P N N N P N N N P N P P P N N P N P P P N P N N C N N N N N N N N N P P N N N N P N N C N P N P P N P P N N P N P P P P P P P P P P P N P N N N N N P N P N N P P N N N P P P ...
output:
Q 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 Output is correct (P=0.005256, F=51.1, Q=47.3) -> 90.00 points
Test #20:
score: 90
Accepted
time: 75ms
memory: 3744kb
input:
1000 0.011546 300 P P N P N P N P P P N P N N N N N P N P N N N N P P N N P P P P P P P P P N P P P P P P N P N P P N P N P P P N P P N N N N N N N N N N N P P N P N P P P N N N N P N P N N P N P N P N P N P P N N C N N P P P N P P N N N N N N P N N P N P P N N N N N N N N N P N N N N N N N P N N P ...
output:
Q 1111111111111111111111111111111111111111111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 Output is correct (P=0.011546, F=94.9, Q=92.5) -> 90.00 points
Test #21:
score: 90
Accepted
time: 131ms
memory: 3868kb
input:
1000 0.028545 300 P P P P P P N N N N P P P P N N N P N N N P P P P N P N N N P N P N P P P P N P N P P N P P N N N N N N P P P P P P N P P P P P N P N P N N P N P P N N P P P P N P P P P P P P P N P P N P P P N N N N P P N P N N N N P N P P P P N N P P N P N P N P P N N P P P P P P N N N P N P P P ...
output:
Q 1111111111111111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 1.0 1.0 Output is correct (P=0.028545, F=191.5, Q=191.5) -> 90.00 points
Test #22:
score: 88.56
Acceptable Answer
time: 181ms
memory: 4048kb
input:
1000 0.039856 300 P N P N P N P P N P N P P P N N N N N N N N N N P N N P P N P N N P P P P P P N P P N P N P P N N P N P P P P P P N N N N P N N P P N P P P P N N P P P N P N P P P N P N P N P P N N N N N N N N N P P P P P N P N N N N N P P N P N N P N N P P N N P P P N P N P P P N N P P P P P P P ...
output:
Q 1111111111111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.9840 0.984 Output is correct (P=0.039856, F=246.3, Q=247.3) -> 88.56 points
Test #23:
score: 84.46
Acceptable Answer
time: 246ms
memory: 3808kb
input:
1000 0.068648 300 N P N P P P P N P P P N P P P P P P N P P P N P P P P P P P P P N P N N N P P N N N N P P N N P N N N P N N N N N P N N P N N P P N P N N N N N N N P N P N P N N N P P P P P P P P P P N P P N N N N P P P P N N P P P N N N P N N N P N N N N N N P P N N P N P P P N P P N N P N N P P ...
output:
Q 1111111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.93844444440 0.9384444444 Output is correct (P=0.068648, F=366.2, Q=372.2) -> 84.46 points
Test #24:
score: 83.72
Acceptable Answer
time: 331ms
memory: 3868kb
input:
1000 0.104571 300 N N N P N P P N N P P P P P P P N P P P P N N N P P N P P N P N N P P N N P P P P P P N P P P P N P P P P P P P N N N N N N P N P P N N P N P P N N P N P N N N N N P N P N P P P N P N P P P P N P N P P N P N P N N P N P N N N P N P N P P N P P P P P N P N P N N P N P P N P P N N P ...
output:
Q 1111110000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.93022222220 0.9302222222 Output is correct (P=0.104571, F=490.3, Q=499.5) -> 83.72 points
Test #25:
score: 76.25
Acceptable Answer
time: 494ms
memory: 3808kb
input:
1000 0.158765 300 N N N P P P N N P P P P N P N N P P P P N N N N N N N P P P P P P P N N N N P P N N N P N P N N N P P P P N P P N N N P P P P N N P N N P P N P N N N P P P N N N N N P N N P P P P P P P P N P N N N N N N P N P N P N N P P N P P P P P P P N P N P N P P P N P N P P P N N P P P P P P ...
output:
Q 1111100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.84722222220 0.8472222222 Output is correct (P=0.158765, F=639.1, Q=667.9) -> 76.25 points
Test #26:
score: 85.55
Acceptable Answer
time: 593ms
memory: 3824kb
input:
1000 0.2 300 N P P P N P P P P P N N N N N P P N P P N P P P N P P P P P N P N P P P N P N N P P N P N N P P P N P P N P N P N N N P N P P P P P P P N P P N N P P N P N N P N N N N N P P N P P N P P P P N P N P N P P P P P P N P N P N P P N P P N P P N N N N P P N P P P P P P P N P N P N N N N P N P...
output:
Q 1111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000...
result:
points 0.95055555560 0.9505555556 Output is correct (P=0.2, F=731.4, Q=740.9) -> 85.55 points