Compilare: main.cpp: In function 'std::ostream& operator<<(std::ostream&, answer)': main.cpp:22:5: warning: no return statement in function returning non-void [-Wreturn-type] 22 | } | ^ main.cpp: In function 'int main()': main.cpp:51:13: warning: unused variable 'index' [-Wunused-variable] 51 | int index = 1; | ^~~~~ main.cpp:54:13: warning: unused variable 'mem_length' [-Wunused-variable] 54 | int mem_length = ans.length; | ^~~~~~~~~~ main.cpp:48:38: warning: 'left' may be used uninitialized [-Wmaybe-uninitialized] 48 | ans = {v.back(), left, i - left + 1}; | ~~^~~~~~ main.cpp:41:9: note: 'left' was declared here 41 | int left; | ^~~~