Compilare: main.c: In function 'main': main.c:7:5: 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("%u",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:36: 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("%u",&n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:7:69: 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("%u",&n); ^~~~~~~~~~~~~~ main.c:13:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(scanf("%u",&k),i=0;i<k;++i) { ^~~~~~~~~~~~~~ main.c:14:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%u%u",&p,&x),w=p; ^~~~~~~~~~~~~~~~~~~ main.c:19:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] for(scanf("%u",&j),i=0;i<j;++i) ^~~~~~~~~~~~~~ main.c:20:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%u%u",&p,&y),e[p]=y; ^~~~~~~~~~~~~~~~~~~