@[Eternal蒟蒻](/user/398190) A 了
```cpp
#include<iostream>
#include<cmath>
#define ll long long
using namespace std;
ll exgcd(ll a,ll b,ll &x,ll &y){
if(b==0){
x=1,y=0;
return a;
}
ll d=exgcd(b,a%b,y,x);
y-=a/b*x;
return d;
}
ll mul(ll a,ll b,ll p){
ll ans=0;
while(b){
if(b&1)ans=(ans+a)%p;
a=a*2%p;
b>>=1;
}
return ans;
}
int n;
ll m[20],aa[20],inv[20],M[20],t[20];
ll MM=1,y,x;
int main(){
cin>>n;
for(int i=1;i<=n;++i) cin>>aa[i];//为啥abs
for(int i=1;i<=n;++i){
cin>>m[i];
aa[i]=(aa[i]%m[i]+m[i])%m[i];
MM*=m[i];
}
for(int i=1;i<=n;++i){
M[i]=MM/m[i];
exgcd(M[i],m[i],t[i],y);
t[i]=(m[i]+t[i]%m[i])%m[i];
aa[i]=(m[i]+aa[i]%m[i])%m[i];
for(int j=1;j<=aa[i];++j) x=(x+mul(M[i],t[i],MM))%MM;
}
cout<<x%MM;
}
```
by 天南星魔芋 @ 2022-06-18 10:24:18
@[天南星魔芋](/user/399239) 谢谢，过了，但是 $a[i]$ 可能是负数啊
by Celestial_Intertwine @ 2022-06-18 10:26:15
@[Eternal蒟蒻](/user/398190) `aa[i]=(aa[i]%m[i]+m[i])%m[i];`
by 天南星魔芋 @ 2022-06-18 10:26:37
@[天南星魔芋](/user/399239) 哦，wssb
by Celestial_Intertwine @ 2022-06-18 10:27:23
头像好评
by wasm @ 2022-06-18 10:44:22