Compilare: main.cpp: In function 'int main()': main.cpp:64:25: warning: array subscript has type 'char' [-Wchar-subscripts] 64 | positions[sir1[i]].push(i); | ~~~~~~^ main.cpp:73:23: warning: array subscript has type 'char' [-Wchar-subscripts] 73 | if (positions[cur].empty()) | ^~~ main.cpp:78:29: warning: array subscript has type 'char' [-Wchar-subscripts] 78 | int pos = positions[cur].front(); positions[cur].pop(); | ^~~ main.cpp:78:53: warning: array subscript has type 'char' [-Wchar-subscripts] 78 | int pos = positions[cur].front(); positions[cur].pop(); | ^~~