Borderou de evaluare (job #22848)

Compilare: user.cpp: In function ‘int main()’: user.cpp:14:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:20:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:9:11: warning: unused variable ‘i’ [-Wunused-variable] user.cpp:9:13: warning: unused variable ‘j’ [-Wunused-variable] user.cpp:40:6: warning: ‘r’ may be used uninitialized in this function [-Wuninitialized]