제출 #1222252

#제출 시각아이디문제언어결과실행 시간메모리
1222252jakeob77COVID tests (CEOI24_covid)C++20
컴파일 에러
0 ms0 KiB
#include <cassert> #include <cstdio> #include <string> #include <vector> /// You may use: // 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 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'; } /// 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. std::vector<bool> find_positive() { std::vector<bool> answer(N); vector<bool>find(N,false); for(int i=0;i<N;i++){ find[i]=true; answer[i]=test_students(find); find[i]=false; } return answer; } int main() { int T; scanf("%d %lf %d", &N, &P, &T); // 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; }

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'std::vector<bool> find_positive()':
Main.cpp:41:5: error: 'vector' was not declared in this scope
   41 |     vector<bool>find(N,false);
      |     ^~~~~~
Main.cpp:41:5: note: suggested alternatives:
In file included from /usr/include/c++/11/vector:67,
                 from Main.cpp:4:
/usr/include/c++/11/bits/stl_vector.h:389:11: note:   'std::vector'
  389 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
In file included from Main.cpp:4:
/usr/include/c++/11/vector:86:13: note:   'std::pmr::vector'
   86 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
Main.cpp:41:12: error: expected primary-expression before 'bool'
   41 |     vector<bool>find(N,false);
      |            ^~~~
Main.cpp:43:9: error: 'find' was not declared in this scope; did you mean 'std::find'?
   43 |         find[i]=true;
      |         ^~~~
      |         std::find
In file included from /usr/include/c++/11/string:52,
                 from Main.cpp:3:
/usr/include/c++/11/bits/stl_algo.h:3876:5: note: 'std::find' declared here
 3876 |     find(_InputIterator __first, _InputIterator __last,
      |     ^~~~
Main.cpp: In function 'bool test_students(std::vector<bool>)':
Main.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:52:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |     scanf("%d %lf %d", &N, &P, &T);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:68:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~