Compilare: main.c: In function 'main': main.c:16:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("doi.in","r",stdin),freopen("doi.out","w",stdout),scanf("%d\n",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:33: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("doi.in","r",stdin),freopen("doi.out","w",stdout),scanf("%d\n",&t); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:16:63: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] freopen("doi.in","r",stdin),freopen("doi.out","w",stdout),scanf("%d\n",&t); ^~~~~~~~~~~~~~~~ main.c:18:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^~~~~~~~~~~~~~ main.c:20:26: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] a[++n]=c-'0',scanf("%c",&c); ^~~~~~~~~~~~~~