Eroare de compilare: user.c:3:21: error: empty character constant char s[5000001],r,j='',c[5000001],t; ^ user.c: In function ‘main’: user.c:8:19: error: empty character constant if(j!='') ^ user.c:5:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar3.in","r",stdin),freopen("numar3.out","w",stdout),scanf("%d\n%s\n",&n,s),c[++l]=t=s[0]; ^ user.c:5:43: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar3.in","r",stdin),freopen("numar3.out","w",stdout),scanf("%d\n%s\n",&n,s),c[++l]=t=s[0]; ^ user.c:5:74: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("numar3.in","r",stdin),freopen("numar3.out","w",stdout),scanf("%d\n%s\n",&n,s),c[++l]=t=s[0]; ^