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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. string solve(string &s,int n, int k){
  4. 	bool processed[26];
  5. 	memset(processed, false, sizeof(processed));
  6. 	vector<int>indicesFor[26];
  7. 	for(int i=0;i<n;i++)indicesFor[s[i]-'a'].push_back(i);
  8.  
  9. 	for(int i=0;i<n;i++){
  10. 		if(k<=0)break;
  11. 		if(s[i]=='a')continue; // just for the shake of optimization (not needed though)
  12.  
  13. 		int delta = min(k, s[i]-'a');
  14. 		char hi = s[i];
  15. 		char lo = s[i]-delta;
  16.  
  17. 		for(int j=hi-'a';j>lo-'a';j--){
  18. 			if(processed[j])break;
  19. 			for(auto idx:indicesFor[j])s[idx]=lo;
  20. 			processed[j]=true;
  21. 		}
  22.  
  23. 		k-=delta;
  24. 		// break;
  25. 	}
  26.  
  27. 	return s;
  28. }
  29. int main() {
  30. 	int t;
  31. 	cin>>t;
  32. 	while(t--){
  33. 		int n,k;
  34. 		string s;
  35. 		cin>>n>>k>>s;
  36. 		cout<<solve(s,n,k)<<"\n";
  37. 	}
  38. }
Success #stdin #stdout 0.01s 5460KB
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https://ideone.com/CRo1BK
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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