izvor.cpp: In function `bool veriffr(int, int)': izvor.cpp:18: warning: comparison between signed and unsigned integer expressions izvor.cpp: In function `bool verifizv()': izvor.cpp:32: warning: comparison between signed and unsigned integer expressions izvor.cpp: In function `void back(int)': izvor.cpp:40: warning: comparison between signed and unsigned integer expressions izvor.cpp:44: warning: comparison between signed and unsigned integer expressions izvor.cpp: In function `int main()': izvor.cpp:58: warning: comparison between signed and unsigned integer expressions