Compilare: user.cpp: In function ‘int main()’: user.cpp:54:26: warning: unused variable ‘st’ [-Wunused-variable] int N,K,i,j,l,sf,P,t,st,dr,mid; ^ user.cpp:54:29: warning: unused variable ‘dr’ [-Wunused-variable] int N,K,i,j,l,sf,P,t,st,dr,mid; ^ user.cpp:54:32: warning: unused variable ‘mid’ [-Wunused-variable] int N,K,i,j,l,sf,P,t,st,dr,mid; ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:19:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF_SIZE, f); ^