Compilare: user.cpp: In function ‘int main()’: user.cpp:86:21: warning: unused variable ‘z’ [-Wunused-variable] int n,m,i,j,x,y,z,lca,op; ^ user.cpp:86:23: warning: unused variable ‘lca’ [-Wunused-variable] int n,m,i,j,x,y,z,lca,op; ^ user.cpp:86:27: warning: unused variable ‘op’ [-Wunused-variable] int n,m,i,j,x,y,z,lca,op; ^ user.cpp:87:11: warning: variable ‘root’ set but not used [-Wunused-but-set-variable] nod * root; ^ user.cpp:84:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delay.in","r",stdin); ^ user.cpp:85:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("delay.out","w",stdout); ^ user.cpp:89:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:91:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&co[i]); ^ user.cpp:94:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:127:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^