oj.uz

Submission #1109500

# Submission time Handle Problem Language Result Execution time Memory
1109500 2024-11-07T00:35:23 Z 8pete8 COVID tests (CEOI24_covid) C++17
10 / 100
 5294 ms 588 KB 
#include <cassert>
#include <cstdio>
#include <string>
#include <vector>
using namespace std;
int N;
double P;
bool test_students(std::vector<bool> mask) {
    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';
}
 
int T;
int answer[1001+10];
void solve(int ql,int qr){
    int l=ql,r=qr;
    vector<bool>qry(N,0);
    while(l<=qr){
        r=qr;
        int pos=N;
        for(int j=0;j<N;j++)qry[j]=0;
        for(int j=l;j<=r;j++)qry[j]=1;
        if(!test_students(qry))return;
        while(l<=r){
            int mid=l+(r-l)/2;
            for(int j=0;j<N;j++)qry[j]=0;
            for(int j=l;j<=mid;j++)qry[j]=1;
            if(test_students(qry))pos=min(pos,mid),r=mid-1;
            else l=mid+1;
        }
        if(pos==N)return;
        l=pos+1;
        answer[pos]=1;
    }
}
void find_positive(int gap){
    for(int j=0;(j*gap)<N;j++){
        solve(j*gap,min(N-1,(j*gap)+gap-1));
    }
}
int main() {
    scanf("%d %lf %d", &N, &P, &T);
    for (int i = 0; i < T; i++) {
        for(int j=0;j<N;j++)answer[j]=0;
        int gap;
        if(T==1)gap=1;
        else if(P==0.001)gap=700;
        else if(P==0.005256)gap=138;
        else if(P==0.011546)gap=63;
        else if(P==0.028545)gap=25;
        else if(P==0.039856)gap=17;
        else if(P==0.068648)gap=10;
        else if (P==0.104571)gap=7;
        else if(P==0.158765)gap=5;
        else if(P==0.2)gap=3;
        else assert(0);
        find_positive(gap);
        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;
}

Compilation message

Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:18:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   18 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Runtime error 1 ms 336 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 37 ms 336 KB Output is correct
2 Correct 31 ms 336 KB Output is correct
3 Correct 36 ms 336 KB Output is correct
4 Correct 34 ms 336 KB Output is correct
5 Correct 31 ms 336 KB Output is correct
6 Correct 39 ms 588 KB Output is correct
7 Correct 30 ms 336 KB Output is correct
8 Correct 23 ms 336 KB Output is correct
9 Correct 37 ms 336 KB Output is correct
10 Correct 25 ms 336 KB Output is correct
11 Correct 21 ms 336 KB Output is correct
12 Correct 29 ms 336 KB Output is correct
13 Correct 28 ms 336 KB Output is correct
14 Correct 27 ms 336 KB Output is correct
15 Correct 32 ms 504 KB Output is correct
16 Correct 36 ms 336 KB Output is correct
17 Correct 20 ms 336 KB Output is correct

Subtask #2
0.0 / 90.0

# Verdict Execution time Memory Grader output
1 Correct 75 ms 336 KB Output is correct (P=0.001, F=15.1, Q=11.0) -> 90.00 points
2 Correct 345 ms 336 KB Output is correct (P=0.005256, F=51.1, Q=48.1) -> 90.00 points
3 Correct 611 ms 336 KB Output is correct (P=0.011546, F=94.9, Q=93.2) -> 90.00 points
4 Correct 1325 ms 336 KB Output is correct (P=0.028545, F=191.5, Q=196.5) -> 81.49 points
5 Correct 1737 ms 336 KB Output is correct (P=0.039856, F=246.3, Q=255.4) -> 78.41 points
6 Correct 2651 ms 336 KB Output is correct (P=0.068648, F=366.2, Q=387.4) -> 73.08 points
7 Correct 3582 ms 336 KB Output is correct (P=0.104571, F=490.3, Q=527.3) -> 69.13 points
8 Correct 4720 ms 336 KB Output is correct (P=0.158765, F=639.1, Q=698.3) -> 65.67 points
9 Execution timed out 5294 ms 336 KB Time limit exceeded (wall clock)
10 Halted 0 ms 0 KB -