Compilare: main.cpp:5:9: warning: '#pragma GCC pop_options' without a corresponding '#pragma GCC push_options' [-Wpragmas] 5 | #pragma GCC pop_options | ^~~ main.cpp: In function 'int main()': main.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 22 | for(i=0; i<s.size()-1; i++) | ~^~~~~~~~~~~ main.cpp:14:9: warning: unused variable 'n' [-Wunused-variable] 14 | int n,op,imp,t,i; | ^