Compilare: main.cpp: In function 'void Init()': main.cpp:19:31: warning: array subscript has type 'char' [-Wchar-subscripts] nextX[x.size() + 1][ch] = -1; ^ main.cpp:20:31: warning: array subscript has type 'char' [-Wchar-subscripts] nextY[y.size() + 1][ch] = -1; ^ main.cpp:19:31: warning: array subscript is above array bounds [-Warray-bounds] nextX[x.size() + 1][ch] = -1; ~~~~~~~~~~~~~~~~~~~~~~^ main.cpp:20:31: warning: array subscript is above array bounds [-Warray-bounds] nextY[y.size() + 1][ch] = -1; ~~~~~~~~~~~~~~~~~~~~~~^