Compilare: main.cpp:3:21: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 3 | using namespace std;main(){ | ^~~~ main.cpp: In function 'int main()': main.cpp:6:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 6 | for(auto&i:a)f>>i;stack<long long>s; | ^~~ main.cpp:6:19: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 6 | for(auto&i:a)f>>i;stack<long long>s; | ^~~~~