Compilare: user.cpp: In function ‘int main()’: user.cpp:84:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] lin[i][j] = an[mult[lin[i][j-1]][base] + x]; ^ user.cpp:84:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] lin[i][j] = an[mult[lin[i][j-1]][base] + x]; ^ user.cpp:85:48: warning: array subscript has type ‘char’ [-Wchar-subscripts] col[i][j] = an[mult[col[i-1][j]][base] + x]; ^ user.cpp:85:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] col[i][j] = an[mult[col[i-1][j]][base] + x]; ^ user.cpp:92:85: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (len <= k && an[lin[i+len][j+len] + mult[r[len+1]][col[i-1][j+len]]] == an[col[i+len][j+len] + mult[r[len+1]][lin[i+len][j-1]]]) ++len; ^ user.cpp:92:144: warning: array subscript has type ‘char’ [-Wchar-subscripts] while (len <= k && an[lin[i+len][j+len] + mult[r[len+1]][col[i-1][j+len]]] == an[col[i+len][j+len] + mult[r[len+1]][lin[i+len][j-1]]]) ++len; ^