tickets.cpp:8:9: error: ambiguating new declaration of 'int64_t find_maximum(int, std::vector<std::vector<int> >)'
8 | int64_t find_maximum(int k, vector<vector<int>> t) {
| ^~~~~~~~~~~~
In file included from tickets.cpp:2:
tickets.h:3:11: note: old declaration 'long long int find_maximum(int, std::vector<std::vector<int> >)'
3 | long long find_maximum(int k, std::vector<std::vector<int>> d);
| ^~~~~~~~~~~~
tickets.cpp: In function 'int64_t find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:27:28: error: no match for 'operator[]' (operand types are '__gnu_cxx::__alloc_traits<std::allocator<std::pair<long long int, int> >, std::pair<long long int, int> >::value_type' {aka 'std::pair<long long int, int>'} and 'int')
27 | res += abs(a[i][j]);
| ^