Compilare: user.cpp: In function ‘int main()’: user.cpp:27:46: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &nrlin, &nrcol, &k); ^ user.cpp:33:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, " %c", &ch); ^ user.cpp:30:10: warning: ‘r’ may be used uninitialized in this function [-Wmaybe-uninitialized] bool r; ^