Compilare: main.cpp: In function 'int main()': main.cpp:189:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){a, h[v], i}); ^ main.cpp:191:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){b, h[v] - 1, i}); ^ main.cpp:193:18: warning: array subscript has type 'char' [-Wchar-subscripts] op[ch].push_back((Query){b, h[v], i}); ^