Compilare: main.cpp: In function 'int main()': main.cpp:35:19: warning: array subscript has type 'char' [-Wchar-subscripts] 35 | stiva[x].push_back(i); | ^ main.cpp:36:24: warning: array subscript has type 'char' [-Wchar-subscripts] 36 | else if(!stiva[paran].empty()) | ^~~~~ main.cpp:39:23: warning: array subscript has type 'char' [-Wchar-subscripts] 39 | arr[stiva[paran].back()] = 1; | ^~~~~ main.cpp:40:19: warning: array subscript has type 'char' [-Wchar-subscripts] 40 | stiva[paran].pop_back(); | ^~~~~