View Compilation Error

0_0_30677638_9275.cpp: In function 'int main()':
0_0_30677638_9275.cpp:69:10: error: converting to 'std::tuple<int, int>' from initializer list would use explicit constructor 'constexpr std::tuple<_T1, _T2>::tuple(_U1&&, _U2&&) [with _U1 = int&; _U2 = int; <template-parameter-2-3> = void; _T1 = int; _T2 = int]'
     a[y] = {x, 0};
          ^