Compilare: user.cpp: In function ‘int main()’: user.cpp:116:13: warning: unused variable ‘v’ [-Wunused-variable] int v, f=min(x2-x1+1, y2-y1+1), step; ^ user.cpp: In function ‘int getInt()’: user.cpp:20:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin); ^ user.cpp:29:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin); ^ user.cpp: In function ‘char getChar()’: user.cpp:43:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin), ptr=0;; ^ user.cpp:47:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, maxb, 1, fin), ptr=0; ^