Compilare: user.cpp: In function ‘int main()’: user.cpp:108:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:110:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp:25:10: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] n = i; ^ user.cpp:19:9: note: ‘i’ was declared here int i; ^ user.cpp:25:10: warning: ‘i’ may be used uninitialized in this function [-Wmaybe-uninitialized] n = i; ^ user.cpp:19:9: note: ‘i’ was declared here int i; ^