Compilare: user.cpp: In function 'void generate()': user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp:23: warning: comparison between signed and unsigned integer expressions user.cpp:17: warning: unused variable 'j' user.cpp: In function 'void solve()': user.cpp:35: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: comparison between signed and unsigned integer expressions user.cpp:42: warning: comparison between signed and unsigned integer expressions user.cpp:48: warning: comparison between signed and unsigned integer expressions user.cpp:34: warning: unused variable 'j'