Compilare: user.cpp: In function ‘bool caut(int, int, int)’: user.cpp:55:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<myhash[s].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:62:22: 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,si); ^ user.cpp: In function ‘void read(int&)’: user.cpp:25:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,MAX,1,si),pos=0; ^ user.cpp:31:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(f,MAX,1,si),pos=0; ^