Compilare: user.cpp: In function ‘bool ok(unsigned int)’: user.cpp:11:19: warning: suggest parentheses around comparison in operand of ‘^’ [-Wparentheses] return (x%s)^k== ((1<<s)-1) % s; ^ user.cpp: In function ‘void read()’: user.cpp:21:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < T ; ++i) ^ user.cpp:27:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < n ; ++i) ^ user.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < m; ++j) ^