Compilare: main.cpp: In function 'int solve(std::__cxx11::string, std::__cxx11::string)': main.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < a.size() ; ++ i) { ~~^~~~~~~~~~ main.cpp:48:9: warning: unused variable 'sum' [-Wunused-variable] int sum(0), cnt(0) ; ^~~ main.cpp: In function 'int solve1(std::__cxx11::string, std::__cxx11::string)': main.cpp:61:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0 ; i < a.size() ; ++ i) { ~~^~~~~~~~~~ main.cpp:70:9: warning: unused variable 'sum' [-Wunused-variable] int sum(0), cnt(0) ; ^~~ main.cpp: In function 'int main()': main.cpp:138:17: warning: unused variable 'ans' [-Wunused-variable] int ans = solve1(a, b); ^~~