Compilare: user.cpp: In function ‘int main()’: user.cpp:42:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &n, &m); ^ user.cpp:45:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^ user.cpp:53:18: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] nrc++; ^