Compilare: main.cpp: In function 'Treap* insert(Treap*, int)': main.cpp:70:34: warning: narrowing conversion of 'rng.std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>::operator()<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>()' from 'std::mersenne_twister_engine<long unsigned int, 32ul, 624ul, 397ul, 31ul, 2567483615ul, 11ul, 4294967295ul, 7ul, 2636928640ul, 15ul, 4022730752ul, 18ul, 1812433253ul>::result_type {aka long unsigned int}' to 'int' inside { } [-Wnarrowing] Treap* solo = new Treap{key, rng(), nill, nill}; ~~~^~ main.cpp: At global scope: main.cpp:141:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^