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Dec 10th, 2018
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6. string str1, str2;
  7. while( getline(cin, str1)){ //輸入str1
  8. getline(cin, str2); //輸入str2
  9. for( int i = 'a'; i <= 'z'; i++){ //從字母'a'開始找
  10. for( int j = 0; j < str1.size(); j++){ //從找str1有沒有a
  11. if( (char)i == str1[j]){ //如果有的話
  12. for( int k = 0; k < str2.size(); k++){ //找str2有沒有a
  13. if( (char)i == str2[k]){ //如果有的話
  14. cout << (char)i; //印出'a'
  15. str2.erase(k,1); //把str2從頭找到的第一個'a'刪掉,免得下次又找到他
  16. break; //跳出str2,再從str1的下一位開始找有沒有'a'
  17. }
  18. }
  19. }
  20. }
  21. }
  22. cout << endl; //記得換行
  23. }
  24. return 0;
  25. }
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