Compilare: user.c: In function ‘main’: 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; ^