Compilare: main.cpp: In function 'int main()': main.cpp:66:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for (i = 0; i < l && i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:71:12: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (; i < s.size(); i++) { | ~~^~~~~~~~~~ main.cpp:74:15: warning: 'sol' may be used uninitialized in this function [-Wmaybe-uninitialized] 74 | sol = (sol + calc(l)) % MOD; | ~~~~~^~~~~~~~~~