Compilare: user.cpp: In function ‘int main()’: user.cpp:139:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("unicat.in","r",stdin); ^ user.cpp:140:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("unicat.out","w",stdout); ^ user.cpp:141:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s%s", (a+1),(b+1)); ^ user.cpp: In function ‘void Z_Alg(char*, int)’: user.cpp:56:17: warning: ‘M’ may be used uninitialized in this function [-Wmaybe-uninitialized] ip=2*M-i; L=2*M-R; ^