Compilare: user.cpp: In function ‘int main()’: user.cpp:175:16: warning: variable ‘act’ set but not used [-Wunused-but-set-variable] Person act = Pr[i]; ^ user.cpp:192:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<ans.size();i++){ ^ user.cpp:142:37: 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:143:39: 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:145:25: 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(int)’: user.cpp:87:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] void read(int idd){ scanf("%d%d",&dist,&c); id = idd; } ^ user.cpp: In member function ‘void Person::read(int)’: user.cpp:96:46: 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); id = idd; } ^