Compilare: user.cpp: In function ‘void read()’: user.cpp:70:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.cpp:72:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a[i]); ^ user.cpp:73:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &m); ^ user.cpp:77:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &operation, &y); ^ user.cpp:31:16: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] return mij-1; ^ user.cpp:12:30: note: ‘mij’ was declared here int left = 1, right = n, mij; ^