Borderou de evaluare (job #389900)

Compilare: user.cpp: In function ‘int main()’: user.cpp:34:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:41:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:49:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:12:21: warning: unused variable ‘k’ [-Wunused-variable] user.cpp:55:13: warning: ‘ok’ may be used uninitialized in this function [-Wuninitialized]