Compilare: main.cpp: In function 'treapNode* ins(ptr, const contestant&, const int&)': main.cpp:110:75: warning: narrowing conversion of '(rng.std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::operator()() % ((std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::result_type)((int)mod)))' from 'std::mersenne_twister_engine<long unsigned int, 32, 624, 397, 31, 2567483615, 11, 4294967295, 7, 2636928640, 15, 4022730752, 18, 1812433253>::result_type' {aka 'long unsigned int'} to 'int' [-Wnarrowing] 110 | return join(join(p1.first, new treapNode{emptyNode, emptyNode, x, rng() % mod, 1, k, k}), p1.second); | ~~~~~~^~~~~