Compilare: main.cpp: In function 'int main()': main.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if (lg == s.length()) { | ~~~^~~~~~~~~~~~~ main.cpp:63:17: warning: 'void operator delete(void*, std::size_t)' called on unallocated object 'Q' [-Wfree-nonheap-object] 63 | delete &Q; | ^ main.cpp:41:32: note: declared here 41 | queue <pair<int, int>> Q; | ^ main.cpp:63:17: warning: 'void operator delete(void*, std::size_t)' called on unallocated object 'Q' [-Wfree-nonheap-object] 63 | delete &Q; | ^ main.cpp:41:32: note: declared here 41 | queue <pair<int, int>> Q; | ^ main.cpp:63:17: warning: 'void operator delete(void*, std::size_t)' called on unallocated object 'Q' [-Wfree-nonheap-object] 63 | delete &Q; | ^ main.cpp:41:32: note: declared here 41 | queue <pair<int, int>> Q; | ^ main.cpp:63:17: warning: 'void operator delete(void*, std::size_t)' called on unallocated object 'Q' [-Wfree-nonheap-object] 63 | delete &Q; | ^ main.cpp:41:32: note: declared here 41 | queue <pair<int, int>> Q; | ^