Compilare: user.cpp: In function ‘int main()’: user.cpp:9:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:12:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&val); ^ user.cpp:27:22: warning: ‘cate’ may be used uninitialized in this function [-Wmaybe-uninitialized] nr=v[prev-1]+cate; ^