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Accepts了，但是花的时间很多，请问如何优化？

Posted by xiaohao2009 at 2009-04-28 18:09:23 on Problem 3438 
这条是水题，Accepts了，但是却花了641MS，感觉好多啊，请问如何优化？完整代码如下：
#include<iostream>
#include<string>
using namespace std;

int main()
{
    int n,i,j,k,flag,m;
    string str;
    cin>>n;
    for(k=0;k<n;k++)
    {
                    cin>>str;
                    for(j=0;j<str.size();j=m)
                    {
                                             i=j+1;
                                             flag=1;
                                             for(i=j+1,flag=1;str[i]==str[j];i++)
                                             flag++;
                                             m=i;
                                             cout<<flag<<str[j];
                    }
                    cout<<endl;
    }

    return 0;
}
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