CodeEval - One zero, two zeros... - Easy

import sys

def have_zeroes(num,val):
    val_bin = bin(val)[2:]
    counter = 0
    for c in val_bin:
        if c == '0':
            counter += 1
    return counter == num

def range_vals(num,val):
    counter = 0
    for i in range(1,val+1):
        if have_zeroes(num,i):
            counter += 1
    return counter

test_cases = open(sys.argv[1], 'r')
for test in test_cases:
   arr = map(int, test.split())
   print range_vals(arr[0],arr[1])

test_cases.close()

CodeEval - Column Names - Moderate

import sys

test_cases = open(sys.argv[1], 'r')
for test in test_cases:
    value=int(test)
    result = ""
    while (value > 0):
        value-=1;
        result = str(chr(ord('A') + value % 26)) + result
        value /= 26
    print result

test_cases.close()

UVA - 11952 - Arithmetic

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer();
        int cases =Integer.parseInt(br.readLine());
        for(int i=0;i<cases;i++){
            StringTokenizer st=new StringTokenizer(br.readLine());
            int x=Integer.parseInt(st.nextToken());
            st.nextToken();
            int y=Integer.parseInt(st.nextToken());
            st.nextToken();
            int z=Integer.parseInt(st.nextToken());
            sb.append(getbase(x,y,z)).append("\n");
            String m="";
        }
         
        System.out.print(sb);
    }
  
    static int getbase(int x,int y,int z){
        if(checkones(x+"") && checkones(y+"") && checkones(z+"")){
            if((x+"").length()+(y+"").length()==(z+"").length())
                return 1;
        }
        for(int i=Math.max(Math.max(minbase(x+""),minbase(y+"")),minbase(z+""));i<19;i++){
            int x2=Integer.parseInt(x+"",i);
            int y2=Integer.parseInt(y+"",i);
            int z2=Integer.parseInt(z+"",i);
            if(x2+y2==z2){
                return i;
            }
        }
        return 0;
    }
  
    static boolean checkones(String val){
        for(int i=0;i<val.length();i++){
            if(val.charAt(i)!='1')
                return false;
        }
        return true;
    }
    static int minbase(String val){
       int max=1;
       for(int i=0;i<val.length();i++){
           int temp=val.charAt(i)-'0';
           if(temp>max)
               max=temp;
       }
       return max+1;
    }
}

UVA - 1419 - Binary Clock

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb = new StringBuffer("");
        String m="";
        int cases=Integer.parseInt(br.readLine().trim());
        for(int l=1;l<cases+1;l++){
            String[] str=br.readLine().trim().split(":");
            StringBuilder hour=lengthOfWord(Integer.parseInt(str[0]));
            StringBuilder minute=lengthOfWord(Integer.parseInt(str[1]));
            StringBuilder second=lengthOfWord(Integer.parseInt(str[2]));
            char[][]ver=new char[6][3];
            char[][]hor=new char[3][6];
            for(int i=0;i<6;i++){
                ver[i][0]=hour.charAt(i);
                hor[0][i]=ver[i][0];
                ver[i][1]=minute.charAt(i);
                hor[1][i]=ver[i][1];
                ver[i][2]=second.charAt(i);
                hor[2][i]=ver[i][2];
            }
            sb.append(l).append(" ");
            for(int i=0;i<6;i++){
                for(int j=0;j<3;j++){
                    sb.append(ver[i][j]);
                }
            }
            sb.append(" ");
            for(int i=0;i<3;i++){
                for(int j=0;j<6;j++){
                    sb.append(hor[i][j]);
                }
            }
            sb.append("\n");
        }
        System.out.print(sb);
    }
   
    static StringBuilder lengthOfWord(int h){
        StringBuilder x=new StringBuilder(Integer.toString(h, 2));
        for(int i=x.length();i<6;i++){
                x.insert(0, "0");
        }
        return x;
    }
}