Compilare: main.cpp: In function 'int main()': main.cpp:25:20: warning: 'memset' used with length equal to number of elements without multiplication by element size [-Wmemset-elt-size] 25 | memset(f1, 0, C); | ^ main.cpp:26:20: warning: 'memset' used with length equal to number of elements without multiplication by element size [-Wmemset-elt-size] 26 | memset(f2, 0, C); | ^ main.cpp:34:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (int i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~