```
#include <stdio.h>
#include<string.h>
int main(){
int S1=330000000;
int S=330000000;
int day=1;
int I=34;
int E=65;
int R=0;
float d=1.0/4;
float? d3=40;
float w=0;
float re=0.7;
float ri=0.7;
int dS,dE,dI,dR;
float p=0.001;
float dp;
while(day<1000&&S>0){
day++;
if(day>=40){
dp=0;
p=1-d/re;
}
else
dp=(1-p)*(1-p)/36;
if(day>=80&&d3>10){
d3=d3-0.2;
}
dS=-(w*I*ri+(1-p)*E*re)*(float)S/S1;
dE=w*I*ri+(1-p)*E*re-E*d;
dI=d*E-I/d3;
dR=I/d3;
S=S+dS;
E=E+dE;
I=I+dI;
R=R+dR;
p=p+dp;
printf("day %d 確診病人變化:%d,潛伏期病人變化:%d,退出者變化:%d,普通人變化：%d ",day,dI,dE,dR,dS);
printf("確診累計(jì)病人:%lld,潛伏期病人:%lld,退出者:%lld，現(xiàn)存確診：%d\n",I+R,E,R,I);
// printf("%lld\n",I);
}
return 0;
}
```
