Compilare: user.cpp: In function ‘int main()’: user.cpp:18:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 1u; i <= N; i++) { ^ user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 1u; i <= sum; i++) ^ user.cpp:28:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (auto i = 1u; i <= N; i++) ^ user.cpp:14:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ user.cpp:19:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &V[i]); ^