Compilare: user.cpp: In function ‘int main()’: user.cpp:20:12: warning: unused variable ‘out’ [-Wunused-variable] FILE * out = fopen("rucsac.out", "w"); ^~~ user.cpp:22:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &max_cap); ^ user.cpp:26:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &w[i], &v[i]); ^