Compilare: user.cpp: In function ‘double panta(int, int)’: user.cpp:21:19: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] pair<int,int> p=make_pair(v[i].first,v[i].second); ^ user.cpp:22:19: warning: variable ‘q’ set but not used [-Wunused-but-set-variable] pair<int,int> q=make_pair(v[j].first,v[j].second); ^ user.cpp: In function ‘double len(int, int)’: user.cpp:30:19: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] pair<int,int> p=make_pair(v[i].first,v[i].second); ^ user.cpp:31:19: warning: variable ‘q’ set but not used [-Wunused-but-set-variable] pair<int,int> q=make_pair(v[j].first,v[j].second); ^ user.cpp: In function ‘int main()’: user.cpp:38:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plagiat.in","r",stdin); ^ user.cpp:39:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("plagiat.out","w",stdout); ^ user.cpp:40:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:43:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:45:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].first,&v[i].second); ^