Compilare: user.cpp: In function ‘int main()’: user.cpp:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i <= n; ++i){ ~~^~~~ user.cpp:30:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= n; ++j){ ~~^~~~ user.cpp:31:37: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] c[(int)(((number*)&a[j])->dig[i])] ++; ^~ user.cpp:37:39: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] b[c[(int)(((number*)&a[j])->dig[i])]] = a[j]; ^~ user.cpp:38:37: warning: dereferencing type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing] c[(int)(((number*)&a[j])->dig[i])]--; ^~ user.cpp:40:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j <= n; ++j){ ~~^~~~ user.cpp:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i += 10){ ~~^~~~