Eroare de compilare: user.c: In function ‘main’: user.c:9:13: error: ‘s’ undeclared (first use in this function) s=a[1][1]; ^ user.c:9:13: note: each undeclared identifier is reported only once for each function it appears in user.c:13:16: warning: left-hand operand of comma expression has no effect [-Wunused-value] t=s,k=i,l=j; ^ user.c:13:16: 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("joc.in","r",stdin),freopen("joc.out","w",stdout),scanf("%d%d",&n,&m); ^ user.c:4:37: 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:4:65: 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:7:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]),y=a[i][j-1]>a[i-1][j]?a[i][j-1]:a[i-1][j],e=a[i][j]-y,a[i][j]=y>e?y:e; ^