提出 b4932836-fe8d-469e-bba1-e92b822c464c

コード

#include <bits/stdc++.h>
using namespace std;

int main() {
int Q,T,X;
cin>>Q;
vector<int> vec(A);
for (int i = 0; i < Q; i++) {
    cin>>T;
  if (T=1) {cin>>X;
    vec.vector(X);
  
}
else if (T=2) { cout << vec.at(1) << endl;
  
  vec.pop_back(1); 
}
else {
  cout << str.size() << endl;
  
}

 
}
}

結果

問題	点数	言語	結果	実行時間	メモリ
E - Q	0	C++	WJ	0 ms	0 KiB

コンパイルエラー

Main.cpp: In function 'int main()':
Main.cpp:7:17: error: 'A' was not declared in this scope
    7 | vector<int> vec(A);
      |                 ^
Main.cpp:11:9: error: invalid use of 'std::vector<int>::vector'
   11 |     vec.vector(X);
      |         ^~~~~~
Main.cpp:16:15: error: no matching function for call to 'std::vector<int>::pop_back(int)'
   16 |   vec.pop_back(1);
      |   ~~~~~~~~~~~~^~~
In file included from /usr/include/c++/13/vector:66,
                 from /usr/include/c++/13/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:53,
                 from Main.cpp:1:
/usr/include/c++/13/bits/stl_vector.h:1322:7: note: candidate: 'constexpr void std::vector<_Tp, _Alloc>::pop_back() [with _Tp = int; _Alloc = std::allocator<int>]'
 1322 |       pop_back() _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/13/bits/stl_vector.h:1322:7: note:   candidate expects 0 arguments, 1 provided
Main.cpp:19:11: error: 'str' was not declared in this scope; did you mean 'std'?
   19 |   cout << str.size() << endl;
      |           ^~~
      |           std