C/C++, a dismal 945 characters…

Takes input as parameters:
a.out 5 52%

#include<stdio.h>
#include<memory.h>
#include<stdlib.h>
#define p printf

int h,c,*l,i,w,j,*q,k;const char*
 z;int main(int argc,char**argv)
  {h=atoi(argv[1]);c=(h*h*atoi(
   argv[2])+99)/100;l=new int[
    h*3];for(q=l,i=0,w=1;i<h;
     i++,c=(c-w)&~((c-w)>>31
      ),w+=2)if(c>=w){*q++=
       0;*q++ =0;* q++=w;}
        else {*q++=(c+1)/
         2;*q++=w-c;*q++
          =c/2;}p("_");
           for(i=0;i<h
            ;i ++)p (
             "__");p
              ("\n"
               );q
                =
               l+h
              *3-1;
             for (i=
            --h;i>=0;
           i--){p("%*"
          "s\\",h-i,"")
         ; z= "x\0 \0x";
        for(k=0;k<3;k++,q
       --,z+=2)for(j=0;j<*
      q;j++)p(z);q-=0;p("https://stackoverflow.com/"
     "\n");}q=l;for(i=0;i<=h
    ;i++){z =i==h? "_\0x\0_":
   " \0x\0 ";p("%*s/",h-i,"");
  for(k=0;k<3;k++,q++,z+=2)for(
 j=0;j<*q;j++)p(z);p("\\\n") ;}}

…and the decrypted version of this for us mere humans:

#include <stdio.h>
#include <memory.h>
#include <stdlib.h>

#define p printf

int h, c, *l, i, w, j, *q, k;
const char *z;

int main(int argc, char** argv)
{
    h = atoi(argv [1]);
    c = (h*h*atoi(argv[2])+99)/100;
    l = new int[h*3];
    for (q = l,i = 0,w = 1; i<h; i++,c = (c-w)&~((c-w)>>31),w += 2) {
        if (c>=w) {
            *q++ = 0;
            *q++ = 0;
            *q++ = w;
        } else {
            *q++ = (c+1)/2;
            *q++ = w-c;
            *q++ = c/2;
        }
    }
    p("_");
    for (i = 0; i<h; i++) {
        p("__");
    }
    p("\n");
    q = l+h*3-1;
    for (i = --h; i>=0; i--) {
        p("%*s\\",h-i,"");
        z = "x\0 \0x";
        for (k = 0; k<3; k++,q--,z += 2) {
            for (j = 0; j<*q; j++) {
                p(z);
            }
        }
        p("/\n");
    }
    q = l;
    for (i = 0; i<=h; i++) {
        z = i==h ? "_\0x\0_" : " \0x\0 ";
        p("%*s/",h-i,"");
        for (k = 0; k<3; k++,q++,z += 2) {
            for (j = 0; j<*q; j++) {
                p(z);
            }
        }
        p("\\\n") ;
    }
}