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C# 字符串编辑-insert -erase-find

```cpp#includeusingnamespacestd;intmain(){intt=0;strings;charn,m,a1,a2;getline(cin,s);cin>>n;if(n=='D'){cin>>m;if(s.find(m)==s.npos)//判断是否找到{couta2;for