题友请留步

#include<bits/stdc++.h>
#define str string
using namespace std;
int countAC(str a){
    int l = a.size(), sum = 0;
    bool flag = 1;
    for(int i = 0; i < l - 1 ;i++){
        if(a[i] == 'A' && a[i + 1] == 'C'){
            sum++;
        }else if(a[i] == 'A' && a[i + 1] == 'A' && a[i + 2] != 'C' && flag){//注意只能是AA或CC才能改，后面是防止AAC这种情况来导致修改一次
            sum++;
            i++;
            flag = !flag;
        }else if(a[i + 1] == 'C' && a[i] == 'C' && a[i - 1] != 'A' && flag && i != 0){
            sum++;
            i++;
            flag = !flag;
        }
    }return sum;
}
int main(){
    str a;
    cin >> a;
    cout << countAC(a);
}