Eroare de compilare: user.c: In function ‘main’: user.c:9:13: error: ‘f’ undeclared (first use in this function) f=r; ^ user.c:9:13: note: each undeclared identifier is reported only once for each function it appears in user.c:4:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc.in","r",stdin),freopen("joc.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:4:40: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc.in","r",stdin),freopen("joc.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:4:68: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("joc.in","r",stdin),freopen("joc.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:7:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&r),y=s[i][j-1]>s[i-1][j]?s[i][j-1]:s[i-1][j],e=r-y,s[i][j]=y>e?y:e; ^