Compilare: user.cpp: In function ‘long long int solve(int*, int)’: user.cpp:71:17: warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses] for (i=t+1;i<=m&i<=n&&j;i++) { ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:43:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:17:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^