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