25. （阅读程序写结果）

#include<iostream>
#include<string>
using namespace std;
int main()
{
    string ch; int a[200];
    int b[200];
    int n, i, t, res;
    cin >> ch;
    n = ch.length();
    for (i = 0; i < 200; i++) b[i] = 0;
    for (i = 1; i <= n; i++) {
        a[i] = ch[i - 1] - '0';
        b[i] = b[i - 1] + a[i];
    }
    res = b[n];
    t = 0;
    for (i = n; i > 0; i--) { if (a[i] == 0)
        t++;
        if (b[i - 1] + t < res) res = b[i - 1] + t;
    }
    cout << res << endl; return 0;
}

输入：

1001101011001101101011110001

输出：{{ input(1) }}