opmat.cpp: In function 'int main()': opmat.cpp:59: warning: comparison between signed and unsigned integer expressions opmat.cpp:22: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result opmat.cpp:23: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result opmat.cpp:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result opmat.cpp:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result opmat.cpp: In function 'int giv_poz1(int, int)': opmat.cpp:19: warning: control reaches end of non-void function opmat.cpp: In function 'int giv_poz(int, int)': opmat.cpp:14: warning: control reaches end of non-void function