Compilare: user.cpp: In function ‘double dist(int, int)’: user.cpp:28:20: warning: unused variable ‘ld’ [-Wunused-variable] int k=0,ls,ld,i; ^ user.cpp:38:16: warning: unused variable ‘x’ [-Wunused-variable] double x; ^ user.cpp: In function ‘int main()’: user.cpp:56:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.in","r",stdin); ^ user.cpp:57:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmap.out","w",stdout); ^ user.cpp:59:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:62:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&v[i].x,&v[i].y); ^ user.cpp: In function ‘double dist(int, int)’: user.cpp:28:17: warning: ‘ls’ may be used uninitialized in this function [-Wmaybe-uninitialized] int k=0,ls,ld,i; ^