Compilare: user.cpp: In function ‘int get(int, int)’: user.cpp:17:9: warning: unused variable ‘ans’ [-Wunused-variable] int ans = 0; ^ user.cpp: In function ‘int main()’: user.cpp:31:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &N); ^ user.cpp:36:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^