Compilare: user.cpp: In function ‘int main()’: user.cpp:8:12: warning: unused variable ‘first’ [-Wunused-variable] int t, n, first, last, min, max, i, j, k, v[20000], ok, veryok; ^ user.cpp:8:19: warning: unused variable ‘last’ [-Wunused-variable] int t, n, first, last, min, max, i, j, k, v[20000], ok, veryok; ^ user.cpp:8:25: warning: variable ‘min’ set but not used [-Wunused-but-set-variable] int t, n, first, last, min, max, i, j, k, v[20000], ok, veryok; ^ user.cpp:8:30: warning: variable ‘max’ set but not used [-Wunused-but-set-variable] int t, n, first, last, min, max, i, j, k, v[20000], ok, veryok; ^ user.cpp:10:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:14:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:16:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[1]); ^ user.cpp:22:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[j]); ^