Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:75:50: error: invalid initialization of non-const reference of type ‘fract&’ from an rvalue of type ‘fract’ prob = add(prob, mult(p[i], p[j])); ^ user.cpp:33:7: error: in passing argument 2 of ‘fract add(fract&, fract&)’ fract add(fract& f1, fract& f2) { ^ user.cpp:50:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("porcjoc.in", "r", stdin); ^ user.cpp:51:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("porcjoc.out", "w", stdout); ^ user.cpp:54:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld", &n); ^ user.cpp:59:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld %lld", &b[i].v, &b[i].p); ^