Compilare: user.cpp: In function ‘double kruskal(int)’: user.cpp:32:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^ user.cpp: In function ‘int main()’: user.cpp:52:11: warning: unused variable ‘x’ [-Wunused-variable] int n,x,y,i,j; ^ user.cpp:52:13: warning: unused variable ‘y’ [-Wunused-variable] int n,x,y,i,j; ^ user.cpp:49:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.in","r",stdin); ^ user.cpp:50:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("desen.out","w",stdout); ^ user.cpp:54:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&v[1].x,&v[1].y); ^ user.cpp:58:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^