Language: Java

import java.io.*;
import java.util.*;

public class Main {
    InputStream is;
    PrintWriter out;
    String INPUT = "";
    boolean[] k1;
    int[] k2;
    void solve()
    {
        char[] c = ns().toCharArray();
        k1 = new boolean[c.length];
        k2 = new int[c.length];
        int N = dfs(0,c);
        out.println(N);
        // out.println(k2[0]);
        // out.println(k2[1]);
        // out.println(k2[2]);
        // out.println(k2[3]);
    }

    int dfs(int s, char[] c){
        if(s==c.length){
            return 0;
        }
        if(k1[s] == true){
            return k2[s];
        }
        int tmpmin = Integer.MAX_VALUE;
        int[] t = new int[26];
        int even = 0;
        int odd = 0;
        for(int i = s; i < c.length; i++){
            int tmp = c[i] - 'a';
            if(t[tmp]%2 == 0) odd++;
            if(t[tmp]%2 == 1) odd--;
            if(odd <= 1){
  m
                tmpmin = Math.min(tmpmin,dfs(i+1,c)+1);
            }
            t[tmp]++;
        }
        k1[s] = true;
        k2[s] = tmpmin;
        // out.println(k2[s]);
        return tmpmin;
    }

    void run() throws Exception
    {
        is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
        out = new PrintWriter(System.out);
        
        long s = System.currentTimeMillis();
        solve();
        out.flush();
        if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
    }
    
    public static void main(String[] args) throws Exception { new Main().run(); }
    
    private byte[] inbuf = new byte[1024];
    private int lenbuf = 0, ptrbuf = 0;
    
    private int readByte()
    {
        if(lenbuf == -1)throw new InputMismatchException();
        if(ptrbuf >= lenbuf){
            ptrbuf = 0;
            try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
            if(lenbuf <= 0)return -1;
        }
        return inbuf[ptrbuf++];
    }
    
    private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
    private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
    
    private double nd() { return Double.parseDouble(ns()); }
    private char nc() { return (char)skip(); }
    
    private String ns()
    {
        int b = skip();
        StringBuilder sb = new StringBuilder();
        while(!(isSpaceChar(b) && b != ' ')){
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    
    private char[] ns(int n)
    {
        char[] buf = new char[n];
        int b = skip(), p = 0;
        while(p < n && !(isSpaceChar(b))){
            buf[p++] = (char)b;
            b = readByte();
        }
        return n == p ? buf : Arrays.copyOf(buf, p);
    }
    
    private char[][] nm(int n, int m)
    {
        char[][] map = new char[n][];
        for(int i = 0;i < n;i++)map[i] = ns(m);
        return map;
    }
    
    private int[] na(int n)
    {
        int[] a = new int[n];
        for(int i = 0;i < n;i++)a[i] = ni();
        return a;
    }
    
    private int ni()
    {
        int num = 0, b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private long nl()
    {
        long num = 0;
        int b;
        boolean minus = false;
        while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
        if(b == '-'){
            minus = true;
            b = readByte();
        }
        
        while(true){
            if(b >= '0' && b <= '9'){
                num = num * 10 + (b - '0');
            }else{
                return minus ? -num : num;
            }
            b = readByte();
        }
    }
    
    private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}


Compiler output:
Main.java:39: error: cannot find symbol
  m
  ^
  symbol:   class m
  location: class Main
Main.java:40: error: variable tmpmin is already defined in method dfs(int,char[])
                tmpmin = Math.min(tmpmin,dfs(i+1,c)+1);
                ^
2 errors