Compilare: user.c: In function ‘main’: user.c:4:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in","r",stdin),freopen("lacusta.out","w",stdout),scanf("%hd%hd",&m,&n); ^ user.c:4:44: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in","r",stdin),freopen("lacusta.out","w",stdout),scanf("%hd%hd",&m,&n); ^ user.c:4:76: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("lacusta.in","r",stdin),freopen("lacusta.out","w",stdout),scanf("%hd%hd",&m,&n); ^ user.c:7:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%hd",&a[i][j]); ^