Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
const ll MOD=1000000007;
const double PI=3.14159265358979;
const ll INF= pow(10,18);
typedef pair<ll,ll> P;
typedef vector<ll> vl;
typedef vector<vl> vvl;
#define FOR(i,a,b) for(ll i=a;i<b;i++)
#define rep(i,n) FOR(i,0,n)
string abc="abcdefghijklmnopqrstuvwxyz";
string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";

int main() {
  ll h,w;
  cin >> h >> w;
  vector<char> a(h*w);
  vl cnt(26,0);
  rep(i,h*w){
    cin >> a[i];
    rep(j,26){
      if(abc[j]==a[i]){
        cnt[j]++;
      }
    }
  }
  bool A=true;
  if(h%2==0&&w%2==0){
    rep(i,26){
      if(cnt[i]%4!=0){
        a=false;
      }
    }
  }
  ll k,x=0,y=0;
  else if(h*w%2==0){
    if(h%2==0){
      k=h/2;
    }
    else{
      k=w/2;
    }
    rep(i,26){
      if(cnt[i]%2!=0){
        A=false;
      }
      else if(cnt[i]%4==2){
        x++;
      }
      if(x>k){
        A=false;
      }
    }
  }
  else{
    rep(i,26){
      if(cnt[i]%2==1){
        y++;
        if(cnt[i]%4==3){
          x++;
        }
      }
      if(cnt[i]%4==2){
        x++;
      }
    }
    if(y!=1){
      A=false;
    }
    else if(x>(h/2)+(w/2)){
      A=false;
    }
  }
  if(A){
    cout << "Yes" << endl;
  }
  else{
    cout << "No" << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:11: error: no match for 'operator=' (operand types are 'std::vector<char>' and 'bool')
   32 |         a=false;
      |           ^~~~~
In file included from /usr/include/c++/14/vector:72,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/vector.tcc:210:5: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>]'
  210 |     vector<_Tp, _Alloc>::
      |     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/vector.tcc:211:42: note:   no known conversion for argument 1 from 'bool' to 'const std::vector<char>&'
  211 |     operator=(const vector<_Tp, _Alloc>& __x)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/14/vector:66:
/usr/include/c++/14/bits/stl_vector.h:766:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::vector<_Tp, _Alloc>&&) [with _Tp = char; _Alloc = std::allocator<char>]'
  766 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:766:26: note:   no known conversion for argument 1 from 'bool' to 'std::vector<char>&&'
  766 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |                 ~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:788:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = char; _Alloc = std::allocator<char>]'
  788 |       operator=(initializer_list<value_type> __l)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:788:46: note:   no known conversion for argument 1 from 'bool' to 'std::initializer_list<char>'
  788 |       operator=(initializer_list<value_type> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
a.cc:37:3: error: 'else' without a previous 'if'
   37 |   else if(h*w%2==0){
      |   ^~~~