Compilare: main.cpp: In function 'int main()': main.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:27:24: warning: operation on 'top' may be undefined [-Wsequence-point] 27 | st[top = 1] = max(st[top], x); | ~~~~^~~ main.cpp:13:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 13 | for (i = 0; i < s.size(); i++) | ^~~ main.cpp:52:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 52 | fout << st[top] << "\n"; | ^~~~ main.cpp:10:15: warning: unused variable 'y' [-Wunused-variable] 10 | int i, x, y; | ^