#include<bits/stdc++.h> using namespace std; int main() { string s; cin >> s; map<int, int> p; p['0'] = p['6'] = p['9'] = 1; p['8'] = 2; //直接用map映射記錄答案即可 int ans = 0; for (char c: s) { ans += p[c]; } cout << ans << endl; } ...