Compilare: user.c: In function ‘main’: user.c:5:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("chiftea.in","r",stdin),freopen("chiftea.out","w",stdout),scanf("%d",&t); ^ user.c:5:44: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("chiftea.in","r",stdin),freopen("chiftea.out","w",stdout),scanf("%d",&t); ^ user.c:5:76: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("chiftea.in","r",stdin),freopen("chiftea.out","w",stdout),scanf("%d",&t); ^ user.c:7:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n),r=sqrt(n),printf("%d\n",n==r*r?(4*r):n-r*r>r?(4*r+4):(4*r+2)); ^