Borderou de evaluare (job #541542)

Compilare: user.cpp: In function ‘void prod(int, std::vector<char>&)’: user.cpp:35:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp: In function ‘int main()’: user.cpp:70:12: warning: statement has no effect [-Wunused-value] user.cpp:70:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:70:27: warning: for increment expression has no effect [-Wunused-value] user.cpp:85:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] user.cpp:99:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]