基础题求助

大佬帮忙看一下，样例过了，提交只过了两个数据点，想不通哪里错了

#include <iostream>
using namespace std;
int main() {
    string str_ans = "", str_temp, str_start;
    cin >> str_start;
    int n = str_start.length();
    str_ans += str_start;
    for (int i = 1; i < n; i++) {
        cin >> str_temp;
        str_ans += str_temp;
    }
    // cout << str_ans << endl;
    int pos = 1; // 从第二位开始读取
    int ans[40005] = {0};
    ans[1] = 1;
    int Pos = 1; // 从第二位开始计数
    while (pos <= str_ans.length()) {
        if (str_ans[pos] == str_ans[pos - 1]) {
            ans[Pos] += 1;
        } else {
            ans[Pos + 1] += 1;
            Pos += 1;
        }
        pos += 1;
    }
    cout << n << " ";
    for (int i = 1; i < Pos; i++) {
        cout<< ans[i] << " ";
    }
    return 0;
}