Compilare: user.cpp: In function ‘int main()’: user.cpp:88:69: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] rmq[i][j][logx][0]=getmax(rmq[i][j][logx-1][0],rmq[i+(1<<logx-1)][j][logx-1][0]); ^ user.cpp: In function ‘char nextch()’: user.cpp:11:29: 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); ^