Compilare: main.cpp: In function 'int main()': main.cpp:162:18: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<std::pair<int, int>, double> >::size_type' {aka 'long unsigned int'} [-Wformat=] 162 | printf("%d", solution.size()); | ~^ ~~~~~~~~~~~~~~~ | | | | int std::vector<std::pair<std::pair<int, int>, double> >::size_type {aka long unsigned int} | %ld