View Compilation Error

0_0_21093794_10838.cpp: In function 'int main()':
0_0_21093794_10838.cpp:143:28: error: converting to 'std::vector<std::tuple<int, int, int> >::value_type {aka std::tuple<int, int, int>}' from initializer list would use explicit constructor 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; <template-parameter-2-2> = void; _Elements = {int, int, int}]'
    vp.push_back({ x, y, o });
                            ^