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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n,k,i;
- cin>>n>>k;
- string s;
- cin>>s;
- if(s.size()==1)
- cout<<0<<endl;
- else{
- s[0]=1;
- for(i=1;i<k;i++)
- s[i]=0;
- cout<<s<<endl;
- }
- return 0;
- }
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