Compilare: user.cpp: In function ‘int main()’: user.cpp:150:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp: In function ‘char nextch()’: user.cpp:21:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:160:10: warning: ‘gx’ may be used uninitialized in this function [-Wmaybe-uninitialized] gx/=n; ^ user.cpp:161:10: warning: ‘gy’ may be used uninitialized in this function [-Wmaybe-uninitialized] gy/=n; ^