代码如下：
```cpp
#include <bits/stdc++.h>
using namespace std;
const int N = 150009,M = 409;
int a[N],n,m,ans;
int f[M][M],x,y;
char opt;
inline void read(int &x) {
char ch = getchar(); int p = 1; x = 0;
while(!isdigit(ch)) {
if(ch == '-') p = -1;
ch = getchar();
}
while(isdigit(ch)) {
x = x * 10 + ch - '0';
ch = getchar();
}
x *= p;
}
int main() {
//freopen("C:\\Users\\lenovo\\Desktop\\P3396_3.in","r",stdin);
//freopen("C:\\Users\\lenovo\\Desktop\\P3396_3.ans","w",stdout);
read(n); read(m);
for(int i = 1;i <= n;i++) {
read(a[i]);
for(int p = 1;p <= sqrt(n);p++) {
f[p][i % p] += a[i];
}
}
while(m--) {
scanf("%c",&opt);
read(x); read(y);
if(opt == 'A') {
if(x * x <= n) {
printf("%d\n",f[x][y]);
}else {
ans = 0;
for(int i = y;i <= n;i += x) ans += a[i];
printf("%d\n",ans);
}
}else {
for(int p = 1;p <= sqrt(n);p++) {
f[p][x % p] += (y - a[x]);
}
a[x] = y;
}
}
return 0;
}
```
by TRZ_2007 @ 2021-02-16 14:20:39
Biller is a boker
by Bosun @ 2021-02-16 14:23:46
@[zbs2006](/user/127915) bosun 正常点……
by TRZ_2007 @ 2021-02-16 14:24:29
@[TRZ_2007](/user/86971) Terrier is a boker
by Bosun @ 2021-02-16 14:28:15
对拍程序也给一下，帮忙调一下吧……
code（对拍）：
```cpp
#include <bits/stdc++.h>
using namespace std;
int a[150009],b[150009];
int cont,N = 149999;
int main() {
freopen("C:\\Users\\lenovo\\Desktop\\P3396_3.ans","r",stdin); // read my answer
for(int i = 1;i <= N;i++) scanf("%d",&a[i]);
freopen("C:\\Users\\lenovo\\Desktop\\P3396_3.out","r",stdin); // read accpeted answer
for(int i = 1;i <= N;i++) scanf("%d",&b[i]);
for(int i = 1;i <= N;i++) {
if(a[i] != b[i]) {
printf("WA on %d: yours: %d ans: %d\n",i,a[i],b[i]);
++cont;
}
}
if(!cont) puts("accpeted");
return 0;
}
```
by TRZ_2007 @ 2021-02-16 14:34:25
错误找到了，此贴终结，但是随之而来的还会有一个疑问贴
by TRZ_2007 @ 2021-02-16 15:25:17