Compilare: user.c: In function ‘main’: user.c:12:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.in","r",stdin),freopen("huffman.out","w",stdout),fgets(t,9,stdin); ^ user.c:12:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.in","r",stdin),freopen("huffman.out","w",stdout),fgets(t,9,stdin); ^ user.c:12:73: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] freopen("huffman.in","r",stdin),freopen("huffman.out","w",stdout),fgets(t,9,stdin); ^ user.c:16:8: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(t,9,stdin),q[i]=1000001; ^