Compilare: main.cpp: In function 'int main()': main.cpp:56:9: warning: this 'else' clause does not guard... [-Wmisleading-indentation] 56 | else | ^~~~ main.cpp:58:13: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else' 58 | st.pop(); | ^~