Compilare: main.cpp:11:5: warning: built-in function 'log2' declared as non-function [-Wbuiltin-declaration-mismatch] 11 | int log2[NMAX]; | ^~~~ main.cpp: In function 'int main()': main.cpp:38:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (j = 0; j < v[o[i]].size() && j < v[o[i + 1]].size(); ++j) { | ~~^~~~~~~~~~~~~~~~ main.cpp:38:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (j = 0; j < v[o[i]].size() && j < v[o[i + 1]].size(); ++j) { | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:70:21: warning: format '%d' expects argument of type 'int', but argument 3 has type 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wformat=] 70 | fprintf (fout, "%d\n", v[o[mn]].size()); | ~^ ~~~~~~~~~~~~~~~ | | | | int std::__cxx11::basic_string<char>::size_type {aka long unsigned int} | %ld