Compilare: user.cpp: In function ‘int main()’: user.cpp:96:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:100:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&a[i]); ^ user.cpp: In function ‘int pluss(int, int)’: user.cpp:18:18: warning: iteration 29 invokes undefined behavior [-Waggressive-loop-optimizations] v[i]=w[i]=0; ~~~~^~ user.cpp:17:15: note: within this loop for (i=1;i<=30;i++) ~^~~~