I don't know what's the problem for?

This is my code.

```
void sortColors(int A[], int n) {
int a = 0;
int b = 0;
int c = 0;
for(int i=0; i<n; i++) {
if (A[i] == 0) {
a++;
} else if (A[i] == 1) {
b++;
} else if (A[i] == 2) {
c++;
}
}
for(int i=0; i<a;i++) {
A[i] = 0;
}
for(int i=a; i<a+b; i++) {
A[i] = 1;
}
for(int i=a+b; i<a+b+c; i++) {
A[i] = 2;
}
}
```