Compilare: user.cpp: In function ‘void read()’: user.cpp:48:74: warning: right operand of comma operator has no effect [-Wunused-value] if(h[rx]>=h[ry]) father[ry]=rx,h[rx]=max(h[rx],1+h[ry]),lev[rx]; ^ user.cpp:22:19: warning: variable ‘cx’ set but not used [-Wunused-but-set-variable] int x,y,rx,ry,cx,cy,nrx,nry; ^ user.cpp:22:22: warning: variable ‘cy’ set but not used [-Wunused-but-set-variable] int x,y,rx,ry,cx,cy,nrx,nry; ^ user.cpp:19:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:25:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp: In function ‘int main()’: user.cpp:58:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("meciul.in","r",stdin); ^ user.cpp:59:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("meciul.out","w",stdout); ^ user.cpp:61:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T); ^