Eroare de compilare: user.c: In function ‘main’: user.c:9:24: error: ‘y’ undeclared (first use in this function) for(b[s]=0,i=1;i<=n&&!y;i++) ^ user.c:9:24: note: each undeclared identifier is reported only once for each function it appears in user.c:13:12: warning: left-hand operand of comma expression has no effect [-Wunused-value] y=0,b[t]=b[j]+o[j][t]; ^ user.c:31:27: warning: left-hand operand of comma expression has no effect [-Wunused-value] y=h[t],h[t]=h[t/2],h[t/2]=y,r[h[t]]=t,r[h[t/2]]=t/2; ^ user.c:31:27: warning: value computed is not used [-Wunused-value] user.c:31:48: warning: left-hand operand of comma expression has no effect [-Wunused-value] y=h[t],h[t]=h[t/2],h[t/2]=y,r[h[t]]=t,r[h[t/2]]=t/2; ^ user.c:31:48: warning: value computed is not used [-Wunused-value] user.c:4:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in","r",stdin),freopen("fmcm.out","w",stdout),scanf("%d%d%d%d",&n,&m,&s,&d); ^ user.c:4:38: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in","r",stdin),freopen("fmcm.out","w",stdout),scanf("%d%d%d%d",&n,&m,&s,&d); ^ user.c:4:67: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("fmcm.in","r",stdin),freopen("fmcm.out","w",stdout),scanf("%d%d%d%d",&n,&m,&s,&d); ^ user.c:6:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&i,&j,&l,&k),g[i][a[i]++]=j,g[j][a[j]++]=i,c[i][j]=l,o[i][j]=k,o[j][i]=-k; ^