C++ 代码

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

using namespace std;

int main()
{
    int n;
    string s1,s2;
    cin >> n >> s1 >> s2;
    bool st[n + 1];
    memset(st, false, sizeof st);
    for (int i = 0; i < n; i ++ )
        if(s1[i] != s2[i]) st[i] = true;
    int ans = 0;
    for (int i = 0; i < n; i ++ )
        if(st[i] == true)
        {
            while(st[i] == true) i++ ;
            ans ++;
        }
    cout << ans << endl;
    return 0;
}