Compilare: main.c: In function 'main': main.c:6:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("scara3.in","r",stdin),freopen("scara3.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:36: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("scara3.in","r",stdin),freopen("scara3.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:69: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("scara3.in","r",stdin),freopen("scara3.out","w",stdout),scanf("%d%d",&n,&k); ^~~~~~~~~~~~~~~~~~~ main.c:8:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),a[i]=j; ^~~~~~~~~~~~~~~~~~~ main.c:9:5: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^~~~~~~~~~~~~~ main.c:11:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),s[i]=j; ^~~~~~~~~~~~~~~~~~~