提出 388e2cc4-0015-4bd6-bea8-864ecb3fcbbf

コード

#include <bits/stdc++.h>
#include <vector>
using namespace std;
 
int main()
{
  int Q;
  cin >> Q;
  vector<int> A();
  vector<int> T(Q);

  for(int i = 0;i < Q;i++)
  {
    cin >> T.at(i);

    if(T.at(i) == 1)
    {
      int x;
      cin >> x;
      A.at(A.size()-1) = x;
    }
    else if(T.at(i) == 2)
    {
      cout << A.at(0) << endl;
      A.erase(vec.begin);
    }
    else if(T.at(i) == 3)
    {
      cout << A.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:9:16: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
    9 |   vector<int> A();
      |                ^~
Main.cpp:9:16: note: remove parentheses to default-initialize a variable
    9 |   vector<int> A();
      |                ^~
      |                --
Main.cpp:20:9: error: request for member 'at' in 'A', which is of non-class type 'std::vector<int>()'
   20 |       A.at(A.size()-1) = x;
      |         ^~
Main.cpp:20:14: error: request for member 'size' in 'A', which is of non-class type 'std::vector<int>()'
   20 |       A.at(A.size()-1) = x;
      |              ^~~~
Main.cpp:24:17: error: request for member 'at' in 'A', which is of non-class type 'std::vector<int>()'
   24 |       cout << A.at(0) << endl;
      |                 ^~
Main.cpp:25:9: error: request for member 'erase' in 'A', which is of non-class type 'std::vector<int>()'
   25 |       A.erase(vec.begin);
      |         ^~~~~
Main.cpp:25:15: error: 'vec' was not declared in this scope
   25 |       A.erase(vec.begin);
      |               ^~~
Main.cpp:29:17: error: request for member 'size' in 'A', which is of non-class type 'std::vector<int>()'
   29 |       cout << A.size() << endl;
      |                 ^~~~