Language: C++

#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;
typedef pair<ll, ll> pll;
const int inf = 0x3f3f3f3f;
const ll mod = 1e9 + 7;
void A() {
    int n;
    cin >> n;
    int res = max(0, (n + 999) / 1000 * 1000 - n);
    cout << res << endl;
}
void B() {
    int n;
    cin >> n;
    unordered_map<string, int>cnt;
    cnt["AC"] = 0;
    cnt["WA"] = 0;
    cnt["RE"] = 0;
    cnt["TLE"] = 0;
    for(int i = 0; i < n; i++) {
        string s;
        cin >> s;
        cnt[s]++;
    }
    cout << "AC x " << cnt["AC"] << endl;
    cout << "WA x " << cnt["WA"] << endl;
    cout << "TLE x " << cnt["TLE"] << endl;
    cout << "RE x " << cnt["RE"] << endl;
}
void C() {
    int h, w, k;
    cin >> h >> w >> k;
    vector<vector<char>> grid(h, vector<char>(w, '.'));
    int bl = 0;
    for(int i = 0; i < h; i++) {
        for(int j = 0; j < w; j++) {
            cin >> grid[i][j];
            if(grid[i][j] == '#')
                bl++;
        }
    }
    int res = 0;
    for(int i = 0; i < (1 << h); i++) {

        for(int j = 0; j < (1 << w); j++) {
            int cnt = bl;
            for(int x = 0; x < h; x++) {
                for(int y = 0; y < w; y++) {
                    if(grid[x][y] == '.')
                        continue;
                    if(i & (1 << x) || j & (1 << y))
                        cnt--;
                }
            }
            if(cnt == k)
                res++;
        }
    }
    cout << res << endl;
}

void D() {
    int n;
    cin >> n;
    vector<ll> a(n, 0);
    for(int i = 0; i < n; i++) {
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());
    ll res = 0;
    int len = (n + 1) / 2; //使用a的前len个
    vector<ll> sum(len + 1, 0);
    for(int i = 1; i <= len; i++) {
        sum[i] = sum[i - 1] + a[i - 1];
    }
    res = sum[len] - a[len - 1] + sum[len] - a[0];
    if(n % 2 == 0)
        res += a[len - 1];
    cout << res << endl;
}
void E() {
    int n, k;
    cin >> n >> k;
    vector<ll> a(n, 0);
    for(int i = 0; i < n; i++)
        cin >> a[i];
   scanf("%d%d",&n,&k);
   	for(int i = 0;i < n;++i)	scanf("%d",&a[i]);
    sort(a,a + n);
 
    int res = 1;
    int l = 0,r = n - 1;
    int sign = 1;
    if (k % 2)
    {
        res = a[r--];
        --k;
        if(res < 0) sign = -1;
    }
    while(k)
    {
        ll x = (ll)a[l] * a[l + 1], y = (ll)a[r - 1] * a[r];
        if(x * sign > y * sign)
        {
            res = x % mod * res % mod;
            l += 2;
        }
        else
        {
            res = y % mod * res % mod;
            r -= 2;
        }
        k -= 2;
    }
    printf("%d\n",(res + mod) % mod);
}
void F() {

}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    E();
}


Compiler output:
a.cc: In function 'void E()':
a.cc:93:14: error: no match for 'operator+' (operand types are 'std::vector<long long int>' and 'int')
   93 |     sort(a,a + n);
      |            ~ ^ ~
      |            |   |
      |            |   int
      |            std::vector<long long int>
In file included from /usr/include/c++/14/bits/stl_algobase.h:67,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:627:5: note: candidate: 'template<class _Iterator> constexpr std::reverse_iterator<_Iterator> std::operator+(typename reverse_iterator<_Iterator>::difference_type, const reverse_iterator<_Iterator>&)'
  627 |     operator+(typename reverse_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:627:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'int'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note: candidate: 'template<class _Iterator> constexpr std::move_iterator<_IteratorL> std::operator+(typename move_iterator<_IteratorL>::difference_type, const move_iterator<_IteratorL>&)'
 1798 |     operator+(typename move_iterator<_Iterator>::difference_type __n,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1798:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
   93 |     sort(a,a + n);
      |                ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/basic_string.h:3598:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3598 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3598:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3616:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3616 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3616:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'const _CharT*' and 'std::vector<long long int>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3635:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3635 |     operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3635:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3652:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3652 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3652:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3670:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, _CharT)'
 3670 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3670:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3682:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3682 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3682:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3689:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3689 |     operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3689:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3696:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3696 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3696:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3719:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(const _CharT*, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3719 |     operator+(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3719:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'const _CharT*' and 'std::vector<long long int>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3726:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(_CharT, __cxx11::basic_string<_CharT, _Traits, _Allocator>&&)'
 3726 |     operator+(_CharT __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3726:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   mismatched types 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3733:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, const _CharT*)'
 3733 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3733:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/bits/basic_string.h:3740:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::__cxx11::basic_string<_CharT, _Traits, _Allocator> std::operator+(__cxx11::basic_string<_CharT, _Traits, _Allocator>&&, _CharT)'
 3740 |     operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3740:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
   93 |     sort(a,a + n);
      |                ^
In file included from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/complex:340:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator+(const complex<_Tp>&, const complex<_Tp>&)'
  340 |     operator+(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:340:5: note:   template argument deduction/substitution failed:
a.cc:93:16: note:   'std::vector<long long int>' is not derived from 'const std::complex<_Tp>'
   93 |     sort(a,a + n);
      |                ^
/usr/include/c++/14/complex:349:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator+(const complex<_Tp>&, const