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Submission #1038244

# Submission time Handle Problem Language Result Execution time Memory
1038244 2024-07-29T14:44:40 Z ttamx COVID tests (CEOI24_covid) C++17
95.55 / 100
 1102 ms 424 KB 
#include <bits/stdc++.h>

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n,t,k;
double p;
string ans;

int ask(int l,int r){
    if(l>r)return false;
    string s(n,'0');
    for(int i=l;i<=r;i++)s[i]='1';
    cout << "Q " << s << endl;
    char res;
    cin >> res;
    return res=='P';
}

int solve(int l,int r){
    while(l<r){
        int m=(l+r)/2;
        if(ask(l,m))r=m;
        else l=m+1;
    }
    ans[l]='1';
    return l;
}

void runcase(){
    ans=string(n,'0');
    for(int l=0;l<n;){
        int r=min(l+k-1,n-1);
        if(ask(l,r)){
            l=solve(l,r)+1;
        }else{
            l+=k;
        }
    }
    cout << "A " << ans << endl;
    string s;
    cin >> s;
}

int main(){
    cin.tie(nullptr)->sync_with_stdio(false);
    cin >> n >> p >> t;
    double q=1-p,r=q;
    double cut=0.57;
    if(p==0.2)cut=0.43;
    if(p==0.039856)cut=0.54;
    if(p==0.104571)cut=0.44;
    k=1;
    while(r>cut&&k<n){
        r*=q;
        k++;
    }
    while(t--)runcase();
}

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 5 ms 344 KB Output is correct
3 Correct 4 ms 344 KB Output is correct
4 Correct 5 ms 344 KB Output is correct
5 Correct 4 ms 344 KB Output is correct
6 Correct 4 ms 344 KB Output is correct
7 Correct 5 ms 424 KB Output is correct
8 Correct 7 ms 356 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 2 ms 344 KB Output is correct
11 Correct 4 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Correct 4 ms 344 KB Output is correct
14 Correct 4 ms 344 KB Output is correct
15 Correct 4 ms 344 KB Output is correct
16 Correct 3 ms 344 KB Output is correct
17 Correct 0 ms 344 KB Output is correct

Subtask #2
85.550000004 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 344 KB Output is correct (P=0.001, F=15.1, Q=10.9) -> 90.00 points
2 Correct 62 ms 344 KB Output is correct (P=0.005256, F=51.1, Q=47.0) -> 90.00 points
3 Correct 136 ms 344 KB Output is correct (P=0.011546, F=94.9, Q=91.9) -> 90.00 points
4 Correct 297 ms 344 KB Output is correct (P=0.028545, F=191.5, Q=190.6) -> 90.00 points
5 Correct 367 ms 344 KB Output is correct (P=0.039856, F=246.3, Q=244.0) -> 90.00 points
6 Correct 595 ms 344 KB Output is correct (P=0.068648, F=366.2, Q=365.8) -> 90.00 points
7 Correct 770 ms 344 KB Output is correct (P=0.104571, F=490.3, Q=493.5) -> 87.71 points
8 Correct 987 ms 344 KB Output is correct (P=0.158765, F=639.1, Q=633.1) -> 90.00 points
9 Correct 1102 ms 344 KB Output is correct (P=0.2, F=731.4, Q=740.9) -> 85.55 points