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nếu câu trả lời hữu ích nhé!
#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
string s;
cin>>s;
ll k;
cin>>k;
ll i=0;
while(k>0 &&i<s.size()-1) {
if(s[i]<s[i+1]) {
s.erase(i,1);
k--;
if(i>0)
i--;
}
else
i++;
}
while (k > 0) {
s.pop_back();
k--;
}
cout<<s;
return 0;
}
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