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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#528575 | #9162. COVID tests | Dimash# | 27.32 | 843ms | 4128kb | C++23 | 3.3kb | 2024-08-23 16:25:22 | 2024-08-23 16:25:23 |
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.
vector<int> ord;
bool as(int l,int r) {
vector<bool> ask(N,0);
for(int i = l;i <= min(N - 1,r);i++) {
ask[ord[i]] = 1;
}
return test_students(ask);
}
// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rng(12321);
std::vector<bool> find_positive() {
vector<bool> answer(N),ask(N,0);
ord.resize(N);
iota(ord.begin(),ord.end(),0);
shuffle(ord.begin(),ord.end(),rng);
int col = 0;
function<void(int,int)>go = [&](int l,int r) {
if(l > r) return;
if(l == r) {
col++;
answer[ord[l]] = 1;
return;
}
int mid = (l + r) >> 1;
if(as(l,mid)) {
go(l,mid);
}
if(col < 250 && 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[ord[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: 0ms
memory: 3752kb
input:
1000 0.789673 1 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 N P P P P P P P P P P P P N P P N P P 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 P 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 N P P P P P P P P N P P P P P P P P ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.0 0.0 translate:wrong
Subtask #2:
score: 27.32
Acceptable Answer
Test #18:
score: 50.15
Acceptable Answer
time: 18ms
memory: 4004kb
input:
1000 0.001 300 N N N N N N N N N N C N N P P N N P N P P N N N N N N N N C P P P P P P P N N N P P N P P N P N P N P N N N P P P P 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 N N N N C P N N N N N N N P P N N N N N N N N N C P P N N P P P P N P N N N N N N N N N N C N N N N N N N N N N...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.55722222220 0.5572222222 Output is correct (P=0.001, F=15.1, Q=18.1) -> 50.15 points
Test #19:
score: 74.3
Acceptable Answer
time: 32ms
memory: 4040kb
input:
1000 0.005256 300 P P P P P N N N N N P P N P P P P P N P P P P N N P N P N P N N N N N P P P N P P N N N P N N N N C P P N P P N P P N P P N N N P P P P P P N N N N P N P P N N N N N N N N C N P N N P P N N N P N N N N N N N N N C P P P N N P P P P P P P N P P P P N N N P N P P N P P P P P N N N N ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.82555555560 0.8255555556 Output is correct (P=0.005256, F=51.1, Q=53.8) -> 74.30 points
Test #20:
score: 57.83
Acceptable Answer
time: 76ms
memory: 3948kb
input:
1000 0.011546 300 P P P N P N P N N P P P P N P N N N N N P P P P N N N N N N P P P N P N N P N N P P P N P N P N N N P P N N P N N P P P P P P N P N P P P P P P P P P N P P N N N N P N P P P P P P P P P N P N N N P P P P N N N P P N P N N N N C P P N N N P N P P N P P N P N P N P P P N P P N N P P ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.64255555560 0.6425555556 Output is correct (P=0.011546, F=94.9, Q=108.1) -> 57.83 points
Test #21:
score: 38.79
Acceptable Answer
time: 186ms
memory: 3816kb
input:
1000 0.028545 300 P P P P N N P N N P P P P N P P P N N P P P P P P P N P P P P P P P P N N P P P P P N N N N N P P P P N P N P P N P P P P P P N P N N P P P P P P P N P N P P P P P P P N N P P P P P P P P P P P P P P P N P N P P P P N P N N N P P P P P P N N N N P P P P N P P P P N P P P P P P N N ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.4310 0.431 Output is correct (P=0.028545, F=191.5, Q=254.7) -> 38.79 points
Test #22:
score: 27.32
Acceptable Answer
time: 253ms
memory: 4108kb
input:
1000 0.039856 300 P P P P P P P P N P P N N N N P P P P N P N P N N P P N P N P P N N P N P N P P P P P N N N N P P P P P N P N P N P P N P N P P N N N P P P P P P N P N N N P N P P N P P N N P P P P N P P N N N N P P P N P N P P P N P N P N N P P P P P P N P P N P N N P P N P N P P N N N P P P N P ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.30355555560 0.3035555556 Output is correct (P=0.039856, F=246.3, Q=387.6) -> 27.32 points
Test #23:
score: 27.92
Acceptable Answer
time: 375ms
memory: 3812kb
input:
1000 0.068648 300 P P P P P P P N P N P P N N N P P P P P P N N N P P N P P N N P P N P P N P N P P N P P N N P P P P P N P P N N N N P P N P P N P P P N N P P P P P N P P N P N P P N P P N N N P N P P P P P N N N N P P P N P P N P P N N N P P N P N P N P P N P P P P N P N N N P P P P P N P P N P P ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.31022222220 0.3102222222 Output is correct (P=0.068648, F=366.2, Q=569.8) -> 27.92 points
Test #24:
score: 28.7
Acceptable Answer
time: 784ms
memory: 3868kb
input:
1000 0.104571 300 P P P P P P P P P N P P P N N N P P P N P N P N P P N P N P N P P P P N P N P N N P P P N P P N N P P N P N P N P P N P P P P N P N N N P P P P N P P N N P P P P N P P N P N P N P P P P P N P N P P N P N P 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 P N N P P P N P P N N P P ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.31888888890 0.3188888889 Output is correct (P=0.104571, F=490.3, Q=752.1) -> 28.70 points
Test #25:
score: 29.43
Acceptable Answer
time: 843ms
memory: 4128kb
input:
1000 0.158765 300 P P P P P P N P P N P N P N P P N P P P N P P N P P P P N P N P N P P P P P N P N P N P N P P P P N P N N P P N P P N P N N P P P P P P P N N P N P N P P P P P N N P N P P N P N P P P P N P P N N P N P P P N P N P N P P N P N P N P P P P N P N P P P N N P P N P P P N N P P P P N N ...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.3270 0.327 Output is correct (P=0.158765, F=639.1, Q=968.0) -> 29.43 points
Test #26:
score: 29.14
Acceptable Answer
time: 784ms
memory: 4056kb
input:
1000 0.2 300 P P P P P P N P P P P N P N P P N P P P P P N P P N P P N P P N P N P P N P P P N P P N P N P N P P N P N P N P P N P P N N P P P P N P P N P N P N P P P N P N P P P P P N P N P N P N P P P P P N N N P P N P P P P N N P P P N N P P P N P P N N P P P P P N P P N P N P P P P P P P P N N P...
output:
Q 0101010110110000011000001011010110111101110111001000000010010010010000101111001000111100001000111110110101000110101011110110000011011000001110110010101011100011100010011001110101011010001100001000000011011010001110011000100001110010000001010010010111011110011000001111011111111100111010110100000001...
result:
points 0.32377777780 0.3237777778 Output is correct (P=0.2, F=731.4, Q=1113.3) -> 29.14 points