练习场acm 题目113 字符串替换

#include<iostream>
using namespace std;
int main()
{
string s,s1 = "you",s2 = "we";
int flag;
while(cin>>s)
{
flag = s.find(s1);
while(flag!=string::npos)
{
s.replace(flag,3,s2);
flag = s.find(s1,flag+1);
}
cout<<s<<endl;
}
return 0;
}