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  1. #include <iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. long int ar[26]={0};  //to store frequency of 26 alphabets
  5.  
  6.  
  7. int main(void)
  8. {
  9.          long int n,k,i;
  10.           scanf("%ld %ld",&n,&k);
  11.           char s[n+1];
  12.           scanf(" %s",s);
  13.           char sorted[n+1];   // to store sorted characters in alphabetical order
  14.           strcpy(sorted,s);
  15.           sort(sorted,sorted+n);
  16.           for( i=0;i<strlen(s);i++)
  17.           {
  18.                     char temp=sorted[i];
  19.                     ar[temp-97]+=1;      // increments occurence of alphabet (temp)
  20.  
  21.           }
  22.         long int count=0;
  23.                  while(count<26 && k>0)
  24.                  {
  25.                            int t=ar[count];
  26.                            if(t>0)
  27.                            {
  28.                            if(k>=t)  // if k > total occurence of alphabet then 
  29.                                      // all occurences of this alphabet will be removed.
  30.                            {
  31.  
  32.                                      k=k-t;
  33.                            }
  34.                            else
  35.                            {
  36.                                    ar[count]=k; // otherwise t occurences willbe 
  37.                                                     // reduced by k
  38.                                    k=0;
  39.                            }
  40.                            }
  41.                            count++;
  42.                  }
  43.                  if(count<26)
  44.                  {
  45.                            for(i=count;i<26;i++) // if k becomes zero before reaching 
  46.                                                 // last character all rem. characters 
  47.                            ar[i]=0;              // will remain as it is.
  48.                  }
  49.           for(i=0;i<strlen(s);i++)
  50.           {
  51.  
  52.                     char temp=s[i];
  53.                     if(ar[temp-97]>0)
  54.                     {
  55.                               // cout<<i<<" "<<ar[temp-97]<<endl;
  56.                               s[i]='A';      // to mark its removal later.
  57.                               ar[temp-97]=ar[temp-97]-1;
  58.  
  59.                     }
  60.           }
  61.  
  62.          for(i=0;i<strlen(s);i++)
  63.          {
  64.                    if(s[i]!='A')         //if 'A' not printed.
  65.                    {
  66.                             printf("%c",s[i]);
  67.                    }
  68.          }
  69.  
  70.           return 0;
  71. }
Runtime error #stdin #stdout 0s 4384KB
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Standard input is empty
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Standard output is empty
https://ideone.com/NHKRvH
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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