Compilare: main.cpp: In function 'int main()': main.cpp:16:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for (i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:41:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 41 | for (auto ind : M) | ^~~ main.cpp:43:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 43 | fout.close(); | ^~~~