Program: 159597
Project: 159597
Buggy source:
/** 
 * Adds lands from non basic land (if provided), adds basic lands getting them from provided   {@link RateCallback}}.
 * @param allowedColors
 * @param landCardPool
 * @param callback
 */
private static void addLandsToDeck(List<ColoredManaSymbol> allowedColors,List<String> setsToUse,List<Card> landCardPool,RateCallback callback){
  final Map<String,Integer> colorCount=new HashMap<String,Integer>();
  for (  final Card card : deck.getCards()) {
    for (    String symbol : card.getManaCost().getSymbols()) {
      int count=0;
      symbol=symbol.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
      if (isColoredMana(symbol)) {
        for (        ColoredManaSymbol allowed : allowedColors) {
          if (allowed.toString().equals(symbol)) {
            count++;
          }
        }
        if (count > 0) {
          Integer typeCount=colorCount.get(symbol);
          if (typeCount == null) {
            typeCount=new Integer(0);
          }
          typeCount+=1;
          colorCount.put(symbol,typeCount);
        }
      }
    }
  }
  final Map<String,Integer> colorSource=new HashMap<String,Integer>();
  for (  final ColoredManaSymbol color : ColoredManaSymbol.values()) {
    colorSource.put(color.toString(),0);
  }
  if (landCardPool != null) {
    for (    final Card landCard : landCardPool) {
      deck.getCards().add(landCard);
      for (      Mana mana : landCard.getMana()) {
        for (        ColoredManaSymbol color : allowedColors) {
          int amount=mana.getColor(color);
          if (amount > 0) {
            Integer count=colorSource.get(color.toString());
            count+=amount;
            colorSource.put(color.toString(),count);
          }
        }
      }
    }
  }
  while (deck.getCards().size() < deckSize) {
    ColoredManaSymbol bestColor=null;
    int lowestRatio=Integer.MAX_VALUE;
    for (    final ColoredManaSymbol color : ColoredManaSymbol.values()) {
      final Integer count=colorCount.get(color.toString());
      if (count != null && count > 0) {
        final int source=colorSource.get(color.toString());
        final int ratio;
        if (source < MIN_SOURCE) {
          ratio=source - count;
        }
 else {
          ratio=source * 100 / count;
        }
        if (ratio < lowestRatio) {
          lowestRatio=ratio;
          bestColor=color;
        }
      }
    }
    final Card landCard=callback.getBestBasicLand(bestColor,setsToUse);
    Integer count=colorSource.get(bestColor.toString());
    count++;
    colorSource.put(bestColor.toString(),count);
    deck.getCards().add(landCard);
  }
}

Fixed version (ground truth):
/** 
 * Adds lands from non basic land (if provided), adds basic lands getting them from provided   {@link RateCallback}}.
 * @param allowedColors
 * @param landCardPool
 * @param callback
 */
private static void addLandsToDeck(List<ColoredManaSymbol> allowedColors,List<String> setsToUse,List<Card> landCardPool,RateCallback callback){
  final Map<String,Integer> colorCount=new HashMap<String,Integer>();
  for (  final Card card : deck.getCards()) {
    for (    String symbol : card.getManaCost().getSymbols()) {
      int count=0;
      symbol=symbol.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
      if (isColoredMana(symbol)) {
        for (        ColoredManaSymbol allowed : allowedColors) {
          if (symbol.contains(allowed.toString())) {
            count++;
          }
        }
        if (count > 0) {
          Integer typeCount=colorCount.get(symbol);
          if (typeCount == null) {
            typeCount=new Integer(0);
          }
          typeCount+=1;
          colorCount.put(symbol,typeCount);
        }
      }
    }
  }
  final Map<String,Integer> colorSource=new HashMap<String,Integer>();
  for (  final ColoredManaSymbol color : ColoredManaSymbol.values()) {
    colorSource.put(color.toString(),0);
  }
  if (landCardPool != null) {
    for (    final Card landCard : landCardPool) {
      deck.getCards().add(landCard);
      for (      Mana mana : landCard.getMana()) {
        for (        ColoredManaSymbol color : allowedColors) {
          int amount=mana.getColor(color);
          if (amount > 0) {
            Integer count=colorSource.get(color.toString());
            count+=amount;
            colorSource.put(color.toString(),count);
          }
        }
      }
    }
  }
  while (deck.getCards().size() < deckSize) {
    ColoredManaSymbol bestColor=null;
    int lowestRatio=Integer.MAX_VALUE;
    for (    final ColoredManaSymbol color : ColoredManaSymbol.values()) {
      final Integer count=colorCount.get(color.toString());
      if (count != null && count > 0) {
        final int source=colorSource.get(color.toString());
        final int ratio;
        if (source < MIN_SOURCE) {
          ratio=source - count;
        }
 else {
          ratio=source * 100 / count;
        }
        if (ratio < lowestRatio) {
          lowestRatio=ratio;
          bestColor=color;
        }
      }
    }
    final Card landCard=callback.getBestBasicLand(bestColor,setsToUse);
    Integer count=colorSource.get(bestColor.toString());
    count++;
    colorSource.put(bestColor.toString(),count);
    deck.getCards().add(landCard);
  }
}