Compilare: user.cpp: In function ‘void Read(int&)’: user.cpp:26:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp:32:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp: In function ‘void Readstr(char*)’: user.cpp:42:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp:48:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] pos=0,fread(f,1,MAX,IN); ^ user.cpp: In function ‘int main()’: user.cpp:156:22: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,1,MAX,IN); ^ user.cpp: In function ‘int getanc(int, int, int, int)’: user.cpp:96:27: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] int lw=p,hi=N,mid,last; ^~~~ user.cpp: In function ‘int solve(int)’: user.cpp:96:27: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:119:18: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(x!=C)Query(Y+1,R,1,1); ~~~~~^~~~~~~~~~~