Compilare: user.cpp: In function ‘int get(int, int)’: user.cpp:71:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(lvl[rmq[x][bit]] < lvl[rmq[y - (1 << bit) + 1][bit]]) ^ user.cpp:71:58: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(lvl[rmq[x][bit]] < lvl[rmq[y - (1 << bit) + 1][bit]]) ^ user.cpp:72:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] return rmq[x][bit]; ^ user.cpp:73:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] return rmq[y - (1 << bit) + 1][bit]; ^ user.cpp: In function ‘char nextch()’: user.cpp:14:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^