Language: C++

#include <iostream>
#include <vector>
#include <queue>
#include <math.h>
#include <unordered_map>
#include <cstring>
#include <algorithm>
#include <set>
#include <climits>
#include <numeric>

//usings
using namespace std;

//type def
typedef long long int64;
typedef pair<int, int> ii;

//consts
const int mod = 998244353;

//methods
template<typename T>
bool chmax(T& source, const T& compare_to) {
    if(source < compare_to) {
        source = compare_to;
        return true;
    }
    return false;
}

int modpow(int64 base, int n) {
    int64 ret = 1;
    while(n) {
        if(n & 1) ret = ret * base % mod;
        base = base * base % mod;
        n >>= 1;
    }
    return ret;
}

class Solution {
private:
public:
    int solve(int n, int k, vector<int>& arr) {
        vector<vector<vector<int64>>> dp(n + 1, vector<vector<int>>(k + 1, vector<int>(3)));
        dp[0][0][0] = 1;
        for(int i = 0; i < n; ++i) {
            for(int s = 0; s <= k; ++s) {
                (dp[i + 1][s][0] += dp[i][s][0]) %= mod;
                (dp[i + 1][s][1] += dp[i][s][0] + dp[i][s][1]) %= mod;
                (dp[i + 1][s][2] += dp[i][s][0] + dp[i][s][1] + dp[i][s][2]) %= mod;
                if(s + arr[i] <= k) {
                    (dp[i + 1][s + arr[i]][1] += dp[i][s][0] + dp[i][s][1]) %= mod;
                    (dp[i + 1][s + arr[i]][2] += dp[i][s][0] + dp[i][s][1]) %= mod;
                }
            }
        }
        return dp[n][k][2];
    }
};

int main() {
    int n, k;
    cin >> n >> k;
    vector<int> arr(n);
    for(int i = 0; i < n; ++i) cin >> arr[i];
    Solution sol;
    auto ret = sol.solve(n, k, arr);
    cout << ret << endl;
}

Compiler output:
a.cc: In member function 'int Solution::solve(int, int, std::vector<int>&)':
a.cc:46:91: error: no matching function for call to 'std::vector<std::vector<std::vector<long long int> > >::vector(int, std::vector<std::vector<int> >)'
   46 |         vector<vector<vector<int64>>> dp(n + 1, vector<vector<int>>(k + 1, vector<int>(3)));
      |                                                                                           ^
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   template argument deduction/substitution failed:
a.cc:46:91: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'std::vector<std::vector<int> >')
   46 |         vector<vector<vector<int64>>> dp(n + 1, vector<vector<int>>(k + 1, vector<int>(3)));
      |                                                                                           ^
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; allocator_type = std::allocator<std::vector<std::vector<long long int> > >]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:43: note:   no known conversion for argument 1 from 'int' to 'std::initializer_list<std::vector<std::vector<long long int> > >'
  678 |       vector(initializer_list<value_type> __l,
      |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<std::vector<long long int> > >]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<std::vector<std::vector<long long int> > >&&'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |              ~~~~~~~~~^~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; allocator_type = std::allocator<std::vector<std::vector<long long int> > >; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; allocator_type = std::allocator<std::vector<std::vector<long long int> > >; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; std::__type_identity_t<_Alloc> = std::allocator<std::vector<std::vector<long long int> > >]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:28: note:   no known conversion for argument 1 from 'int' to 'const std::vector<std::vector<std::vector<long long int> > >&'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |              ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; size_type = long unsigned int; value_type = std::vector<std::vector<long long int> >; allocator_type = std::allocator<std::vector<std::vector<long long int> > >]'
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:47: note:   no known conversion for argument 2 from 'std::vector<std::vector<int> >' to 'const std::vector<std::vector<std::vector<long long int> > >::value_type&' {aka 'const std::vector<std::vector<long long int> >&'}
  569 |       vector(size_type __n, const value_type& __value,
      |                             ~~~~~~~~~~~~~~~~~~^~~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; size_type = long unsigned int; allocator_type = std::allocator<std::vector<std::vector<long long int> > >]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:51: note:   no known conversion for argument 2 from 'std::vector<std::vector<int> >' to 'const std::vector<std::vector<std::vector<long long int> > >::allocator_type&' {aka 'const std::allocator<std::vector<std::vector<long long int> > >&'}
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |                             ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >; allocator_type = std::allocator<std::vector<std::vector<long long int> > >]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = std::vector<std::vector<long long int> >; _Alloc = std::allocator<std::vector<std::vector<long long int> > >]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 2 provided