Language: Java

import java.io.*;
import java.math.*;
import java.util.*;
import java.lang.*;

// import java.text.DecimalFormat; 
// import java.text.DecimalFormatSymbols; 
 
 
// Warning: Printing unwanted or ill-formatted data to output will cause the test cases to fail
 
public class TestClass {
    
    static class Reader 
    { 
        final private int BUFFER_SIZE = 1 << 16; 
        private DataInputStream din; 
        private byte[] buffer; 
        private int bufferPointer, bytesRead; 
  
        public Reader() 
        { 
            din = new DataInputStream(System.in); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public Reader(String file_name) throws IOException 
        { 
            din = new DataInputStream(new FileInputStream(file_name)); 
            buffer = new byte[BUFFER_SIZE]; 
            bufferPointer = bytesRead = 0; 
        } 
  
        public String readLine() throws IOException 
        { 
            byte[] buf = new byte[1000001]; // line length 
            int cnt = 0, c; 
            while ((c = read()) != -1) 
            { 
                if (c == '\n') 
                    break; 
                buf[cnt++] = (byte) c; 
            } 
            return new String(buf, 0, cnt); 
        } 
  
        public int nextInt() throws IOException 
        { 
            int ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do
            { 
                ret = ret * 10 + c - '0'; 
            }  while ((c = read()) >= '0' && c <= '9'); 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public long nextLong() throws IOException 
        { 
            long ret = 0; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        public double nextDouble() throws IOException 
        { 
            double ret = 0, div = 1; 
            byte c = read(); 
            while (c <= ' ') 
                c = read(); 
            boolean neg = (c == '-'); 
            if (neg) 
                c = read(); 
  
            do { 
                ret = ret * 10 + c - '0'; 
            } 
            while ((c = read()) >= '0' && c <= '9'); 
  
            if (c == '.') 
            { 
                while ((c = read()) >= '0' && c <= '9') 
                { 
                    ret += (c - '0') / (div *= 10); 
                } 
            } 
  
            if (neg) 
                return -ret; 
            return ret; 
        } 
  
        private void fillBuffer() throws IOException 
        { 
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE); 
            if (bytesRead == -1) 
                buffer[0] = -1; 
        } 
  
        private byte read() throws IOException 
        { 
            if (bufferPointer == bytesRead) 
                fillBuffer(); 
            return buffer[bufferPointer++]; 
        } 
  
        public void close() throws IOException 
        { 
            if (din == null) 
                return; 
            din.close(); 
        } 
    } 
    

    
    public static void main(String args[] ) throws Exception {
        StringBuffer str = new StringBuffer();
        PrintWriter pw=new PrintWriter(System.out);
        Reader sc = new Reader();
    
        int h = sc.nextInt();
        int w = sc.nextInt();
        int k = sc.nextInt();
        char[][] c = new char[h][w];
        for(int i=0;i<h;i++)
            c[i] = sc.readLine().toCharArray();
        
        int ans=0;
        
        for(int x=0;x<(1<<h)-1;x++){
            for(int y=0;y<(1<<w)-1;y++){
                int b=0;
                for(int i=0;i<h;i++){
                    for(int j=0;j<w;j++){
                        if((((x&(1<<i))==0)&&((y&(1<<j))==0))&&c[i][j]=='#')
                            b++;
                    }
                }
                if(b==k)
                    ans++;
                
            }
        }
        
        str.append(ans);
        
        pw.println(str.toString());
        
        pw.close();
    }
    
     
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
    
}

Compiler output:
Main.java:12: error: class TestClass is public, should be declared in a file named TestClass.java
public class TestClass {
       ^
1 error