AcWing 1208. 翻硬币
仅供自己课后学习

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>

using namespace std;
const int N = 100;
int n;
char start[N],aim[N];


void turn(int i)//实现换硬币正反的操作
{

    if(start[i] =='*') start[i] ='o';
    else start[i] = '*';
}

int main(){

    cin>>start>>aim;//两条字符串
    n = strlen(start);

    int res = 0;
    for(int i = 0;i<n-1;i++)
        if(start[i]!=aim[i]){
            turn(i),turn(i+1);
            res++;
        }

    cout<<res<<endl;
    return 0;
}