Compilare: user.cpp: In function ‘int main()’: user.cpp:22:39: warning: operation on ‘i’ may be undefined [-Wsequence-point] a[i++]=v[i]-v[i-1]; ^ user.cpp:22:39: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp:25:50: warning: operation on ‘i’ may be undefined [-Wsequence-point] a[i++]=v[i]-v[i-1]+a[i-d]; ^ user.cpp:25:50: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp:25:50: warning: operation on ‘i’ may be undefined [-Wsequence-point] 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",&t); ^ user.cpp:11:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:14:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&v[i]); ^