Compilare: main.cpp: In function 'treap* ins(treap*, char, int)': main.cpp:76:12: 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()()' 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 'long long int' [-Wnarrowing] 76 | rng(), | ~~~^~ main.cpp:79:12: warning: narrowing conversion of '(((int)ch) - 97)' from 'int' to 'char' [-Wnarrowing] 79 | ch - 'a', | ~~~^~~~~ main.cpp: In function 'int main()': main.cpp:103:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for ( int i = 1; i <= s.size(); i ++ ) { | ~~^~~~~~~~~~~