请懂C语言的解释一下下列代码

#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#define customnum 10000
#define decrease -30
void main()
{
srand(time(NULL));
int i, j, jiexian=13000,renshu;
int t, custom, fenshu[customnum+1];
int index[customnum+1];
int order, p, pp;
FILE *fp;
fp= fopen ("bili.txt", "w");
for(j=1;j<=350;j++)
{
for (i=1;i<=customnum;i++)
{fenshu[i]=5000;index[i]=0;}
renshu=0;
jiexian+=20;
for (t=1;t<=365;t++)
{
for (custom=1;custom<=customnum; custom++)
{
if(index[custom]==-1) continue;
for (i=1;i<=10;i++)
{
order=rand()%10;
if (order==0)
{
p=rand()%10;
if (p==0||p==1)continue;
else{pp=rand()%7;
if(pp<=2) fenshu[custom]+=100;
16
else fenshu[custom]+=decrease;
}continue;
}
if (order>0&&order<6)
{
p=rand()%2;
if (p==1)continue;