Program: 72266
Project: 72266
Buggy source:
public String request(int sid,String msg){
  int playerIndex=0;
  for (int i=0; i < playerNum; i++) {
    if (allPlayers[i].SID == sid) {
      playerIndex=i;
      break;
    }
  }
  String result="String_Node_Str";
switch (gameState) {
case INIT:
    if (playerState[playerIndex] == 0) {
      result=GodHelper.toInit(allUserInfo,"String_Node_Str",heroList);
      playerState[playerIndex]+=1;
    }
 else     if (playerState[playerIndex] == 1) {
      heroChoose(sid,msg);
      gameState=GameState.MAINGAME;
      playerState[playerIndex]=0;
      result=GodHelper.toChooseHero("String_Node_Str",heroChoices,teamResult);
    }
  break;
case MAINGAME:
switch (phaseState) {
case PREPARE:
  if (playerState[playerIndex] == 0) {
    GambleChecker.cardDistribute(cardHeap,allPlayers[playerIndex],4);
    int[] playerHandCard=new int[allPlayers[playerIndex].handCardsNum];
    boolean isSeenCard=true;
    for (int i=0; i < allPlayers[playerIndex].handCardsNum; i++) {
      playerHandCard[i]=allPlayers[playerIndex].handCards[i];
      if ((allPlayers[playerIndex].handCards[i] == 1) || (allPlayers[playerIndex].handCards[i] == 2) || (allPlayers[playerIndex].handCards[i] == 3))       isSeenCard=false;
    }
    if (isSeenCard)     allPlayers[playerIndex].isSeenCard=true;
    result=GodHelper.toCardDistribute("String_Node_Str",playerHandCard);
    playerState[playerIndex]+=1;
  }
 else   if (playerState[playerIndex] == 1) {
    MsgChooseDecision dec=GodHelper.getChooseDecision(msg);
    allPlayers[playerIndex].stratDecision=allPlayers[playerIndex].handCards[dec.decision()];
    GambleChecker.cardToHeap(cardHeap,dec.decision());
    allPlayers[playerIndex].handCards[dec.decision()]=GambleChecker.NOTHING;
    GambleChecker.cardSort(allPlayers[playerIndex].handCards);
    allPlayers[playerIndex].handCardsNum-=1;
    result=GodHelper.toChooseDecision("String_Node_Str");
    playerState[playerIndex]+=1;
  }
 else   if (playerState[playerIndex] == 2) {
    featureChoose(sid,msg,allPlayers[playerIndex]);
    playerState[playerIndex]+=1;
    result=GodHelper.toDecisionFeature("String_Node_Str");
  }
 else   if (playerState[playerIndex] == 3) {
    seenCard(sid,msg,allPlayers[playerIndex]);
    result=GodHelper.toSeenCard("String_Node_Str");
    phaseState=PhaseState.GAMBLE;
    playerState[playerIndex]=0;
  }
break;
case GAMBLE:
if (playerState[playerIndex] == 0) break;
case ACTION:
break;
}
break;
}
if (result.equals("String_Node_Str")) {
System.out.printf("String_Node_Str",sid,msg,gameState.toString());
}
return result;
}

Fixed version (ground truth):
public String request(int sid,String msg){
  int playerIndex=0;
  for (int i=0; i < playerNum; i++) {
    if (allPlayers[i].SID == sid) {
      playerIndex=i;
      break;
    }
  }
  String result="String_Node_Str";
switch (gameState) {
case INIT:
    if (playerState[playerIndex] == 0) {
      result=GodHelper.toInit(allUserInfo,"String_Node_Str",heroList);
      playerState[playerIndex]+=1;
    }
 else     if (playerState[playerIndex] == 1) {
      heroChoose(sid,msg);
      gameState=GameState.MAINGAME;
      playerState[playerIndex]=0;
      result=GodHelper.toChooseHero("String_Node_Str",heroChoices,teamResult);
    }
  break;
case MAINGAME:
switch (phaseState) {
case PREPARE:
  if (playerState[playerIndex] == 0) {
    GambleChecker.cardDistribute(cardHeap,allPlayers[playerIndex],4);
    int[] playerHandCard=new int[allPlayers[playerIndex].handCardsNum];
    boolean isSeenCard=true;
    for (int i=0; i < allPlayers[playerIndex].handCardsNum; i++) {
      playerHandCard[i]=allPlayers[playerIndex].handCards[i];
      if ((allPlayers[playerIndex].handCards[i] == 1) | (allPlayers[playerIndex].handCards[i] == 2) | (allPlayers[playerIndex].handCards[i] == 3))       isSeenCard=false;
    }
    if (isSeenCard)     allPlayers[playerIndex].isSeenCard=true;
    result=GodHelper.toCardDistribute("String_Node_Str",playerHandCard);
    playerState[playerIndex]+=1;
  }
 else   if (playerState[playerIndex] == 1) {
    MsgChooseDecision dec=GodHelper.getChooseDecision(msg);
    if (dec.decision() == -1)     allPlayers[playerIndex].stratDecision=GambleChecker.DEPOSIT;
 else {
      allPlayers[playerIndex].stratDecision=allPlayers[playerIndex].handCards[dec.decision()];
      GambleChecker.cardToHeap(cardHeap,dec.decision());
      allPlayers[playerIndex].handCards[dec.decision()]=GambleChecker.NOTHING;
      GambleChecker.cardSort(allPlayers[playerIndex].handCards);
      allPlayers[playerIndex].handCardsNum-=1;
    }
    result=GodHelper.toChooseDecision("String_Node_Str");
    playerState[playerIndex]+=1;
  }
 else   if (playerState[playerIndex] == 2) {
    featureChoose(sid,msg,allPlayers[playerIndex]);
    playerState[playerIndex]+=1;
    result=GodHelper.toDecisionFeature("String_Node_Str");
  }
 else   if (playerState[playerIndex] == 3) {
    seenCard(sid,msg,allPlayers[playerIndex]);
    result=GodHelper.toSeenCard("String_Node_Str",decisionChoices,seenCardChoices);
    phaseState=PhaseState.GAMBLE;
    playerState[playerIndex]=0;
  }
break;
case GAMBLE:
if (playerState[playerIndex] == 0) {
if (allPlayers[playerIndex].isSeenCard) {
  playerState[playerIndex]+=1;
}
}
break;
case ACTION:
break;
}
break;
}
if (result.equals("String_Node_Str")) {
System.out.printf("String_Node_Str",sid,msg,gameState.toString());
}
return result;
}