Compilare: main.cpp: In function 'int main()': main.cpp:20:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i=0;i<s.size();i++) | ~^~~~~~~~~ main.cpp:20:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 20 | for(int i=0;i<s.size();i++) | ^~~ main.cpp:26:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 26 | for(int i=n;i>=1;i--) | ^~~