Compilare: main.c: In function 'main': main.c:13:5: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("minge.in","r",stdin),freopen("minge.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:13:35: warning: ignoring return value of 'freopen', declared with attribute warn_unused_result [-Wunused-result] freopen("minge.in","r",stdin),freopen("minge.out","w",stdout); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:15:9: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^~~~~~~~~~~~~~