Compilare: main.c: In function 'main': main.c:5:2: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("tort2.in","r",stdin),freopen("tort2.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:32: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("tort2.in","r",stdin),freopen("tort2.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:5:64: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("tort2.in","r",stdin),freopen("tort2.out","w",stdout),scanf("%d%d%d",&m,&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~ main.c:8:13: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]); ^~~~~~~~~~~~~~~~~~~~