Compilare: main.cpp: In function 'int main()': main.cpp:30:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for (int i = 0; i < drum.length(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:38:27: 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 (int i = 0; i < drum.length(); ++i) | ~~^~~~~~~~~~~~~~~ main.cpp:44:21: warning: iteration 100000 invokes undefined behavior [-Waggressive-loop-optimizations] 44 | fact[i] = 1LL * fact[i - 1] * i % mod; | ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:43:27: note: within this loop 43 | for (int i = 1; i <= 100'001; ++i) | ~~^~~~~~~~~~