Language: C++

#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(),(x).end()
#define int long long 
#define vi vector<int>
#define pii pair<int,int>
#define F first
#define S second
#define pb push_back
#define rep(i, a, b) for(int i = a; i < b; i++)
#define repr(i, a, b) for(int i = a - 1; i >= b; i--)
#define iter(m) for(auto it = m.begin(); it != m.end(); it++)
#define iterr(m) for(auto it = m.rbegin(); it != m.rend(); it++)
#define N 500500
#define PI 3.14159265358979323846264338327950L
#define speed ios_base :: sync_with_stdio(0);cin.tie(0);cout.tie(0);
int mx = 0;
int n, m, t;
vector<vector<int>> data;
vector<int> v;
void solve() {
    int sum = 0;
    for(int i = 0; i < t; i++) {
        if(v[data[i][1] - 1] - v[data[i][0] - 1] == data[i][2]) {
            sum += data[i][3];
        }
    }
    mx = max(mx, sum);
}
void rec(int ind) {
    if(ind == n) {
        solve();
        return;
    } else {
        for(int i = 0; i <= 10; i++) {
            if(ind == 0) {
                v[ind] = i;
                rec(ind+1);
            } else {
                v[ind] = v[ind - 1] + i;
                if(v[ind] > m) return;
                rec(ind+1);
            }
        }
    }
}
signed main(){
   speed;
   cin >> n >> m;
   v = vector<int> (n); 
   cin >> t;
   data = vector<vector<int>> (t, vector<int> (4));
   rep(i, 0, t) {
       int a, b, c, d;
       cin >> a >> b >> c >> d;
       data[i][0] = a;
       data[i][1] = b;
       data[i][2] = c;
       data[i][3] = d;
   }
    rec(0);
    cout << mx;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:24:14: error: reference to 'data' is ambiguous
   24 |         if(v[data[i][1] - 1] - v[data[i][0] - 1] == data[i][2]) {
      |              ^~~~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:24:34: error: reference to 'data' is ambiguous
   24 |         if(v[data[i][1] - 1] - v[data[i][0] - 1] == data[i][2]) {
      |                                  ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:24:53: error: reference to 'data' is ambiguous
   24 |         if(v[data[i][1] - 1] - v[data[i][0] - 1] == data[i][2]) {
      |                                                     ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:25:20: error: reference to 'data' is ambiguous
   25 |             sum += data[i][3];
      |                    ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc: In function 'int main()':
a.cc:52:4: error: reference to 'data' is ambiguous
   52 |    data = vector<vector<int>> (t, vector<int> (4));
      |    ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:56:8: error: reference to 'data' is ambiguous
   56 |        data[i][0] = a;
      |        ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:57:8: error: reference to 'data' is ambiguous
   57 |        data[i][1] = b;
      |        ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:58:8: error: reference to 'data' is ambiguous
   58 |        data[i][2] = c;
      |        ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_list<_Tp>)'
  344 |     data(initializer_list<_Tp> __il) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:334:5: note:                 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::data(_Tp (&)[_Nm])'
  334 |     data(_Tp (&__array)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:323:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(const _Container&)'
  323 |     data(const _Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:312:5: note:                 'template<class _Container> constexpr decltype (__cont.data()) std::data(_Container&)'
  312 |     data(_Container& __cont) noexcept(noexcept(__cont.data()))
      |     ^~~~
a.cc:19:21: note:                 'std::vector<std::vector<long long int> > data'
   19 | vector<vector<int>> data;
      |                     ^~~~
a.cc:59:8: error: reference to 'data' is ambiguous
   59 |        data[i][3] = d;
      |        ^~~~
/usr/include/c++/14/bits/range_access.h:344:5: note: candidates are: 'template<class _Tp> constexpr const _Tp* std::data(initializer_