Compilare: user.cpp: In function ‘int main()’: user.cpp:158:16: warning: variable ‘act’ set but not used [-Wunused-but-set-variable] Person act = Pr[i]; ^ user.cpp:126:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri3.in","r",stdin); ^ user.cpp:127:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri3.out","w",stdout); ^ user.cpp:129:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n,&m); ^ user.cpp: In member function ‘void Train::read()’: user.cpp:86:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] void read(){ scanf("%d%d",&dist,&c); } ^ user.cpp: In member function ‘void Person::read(int)’: user.cpp:90:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] void read(int idd){ scanf("%d%d",&st,&en);en--; id = idd; } ^