answer.code:1:24: warning: multi-character character constant [-Wmultichar]
    1 | long q,c,n,i,l,r,m,s,a['一'];main(){for(c=scanf("%d",&q);c<=q;printf("Case #%d: %d\n",c++,l)){for(scanf("%d",&n),i=n;i;)scanf("%d",a+i--);for(l=0,r=3e9;l<r;s<0?r=m:(l=m+1))for(s=m=l+r>>1,i=n;i;--i)a[i]<m?s-=m-a[i]:0;}}
      |                        ^~~~
answer.code:1:30: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type]
    1 | long q,c,n,i,l,r,m,s,a['一'];main(){for(c=scanf("%d",&q);c<=q;printf("Case #%d: %d\n",c++,l)){for(scanf("%d",&n),i=n;i;)scanf("%d",a+i--);for(l=0,r=3e9;l<r;s<0?r=m:(l=m+1))for(s=m=l+r>>1,i=n;i;--i)a[i]<m?s-=m-a[i]:0;}}
      |                              ^~~~
answer.code: In function ‘int main()’:
answer.code:1:43: error: ‘scanf’ was not declared in this scope
    1 | long q,c,n,i,l,r,m,s,a['一'];main(){for(c=scanf("%d",&q);c<=q;printf("Case #%d: %d\n",c++,l)){for(scanf("%d",&n),i=n;i;)scanf("%d",a+i--);for(l=0,r=3e9;l<r;s<0?r=m:(l=m+1))for(s=m=l+r>>1,i=n;i;--i)a[i]<m?s-=m-a[i]:0;}}
      |                                           ^~~~~
answer.code:1:63: error: ‘printf’ was not declared in this scope
    1 | long q,c,n,i,l,r,m,s,a['一'];main(){for(c=scanf("%d",&q);c<=q;printf("Case #%d: %d\n",c++,l)){for(scanf("%d",&n),i=n;i;)scanf("%d",a+i--);for(l=0,r=3e9;l<r;s<0?r=m:(l=m+1))for(s=m=l+r>>1,i=n;i;--i)a[i]<m?s-=m-a[i]:0;}}
      |                                                               ^~~~~~
answer.code:1:1: note: ‘printf’ is defined in header ‘<cstdio>’; this is probably fixable by adding ‘#include <cstdio>’
  +++ |+#include <cstdio>
    1 | long q,c,n,i,l,r,m,s,a['一'];main(){for(c=scanf("%d",&q);c<=q;printf("Case #%d: %d\n",c++,l)){for(scanf("%d",&n),i=n;i;)scanf("%d",a+i--);for(l=0,r=3e9;l<r;s<0?r=m:(l=m+1))for(s=m=l+r>>1,i=n;i;--i)a[i]<m?s-=m-a[i]:0;}}