| 1 | 1 | class BowlingGame: |
| 2 | 2 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 3 | """ |
| 4 | Initialize a new bowling game. |
| 5 | """ |
| 6 | self.rolls = [] |
| 7 | |
| 5 | 8 | def roll(self, pins): |
| 6 | | pass |
| 7 | | |
| 9 | """ |
| 10 | Record a roll in the game. |
| 11 | |
| 12 | Args: |
| 13 | pins (int): Number of pins knocked down in this roll. |
| 14 | |
| 15 | Raises: |
| 16 | ValueError: If the number of pins is invalid. |
| 17 | IndexError: If the game is already complete. |
| 18 | """ |
| 19 | # Edge Case: Invalid pin count (negative or more than 10) |
| 20 | if pins < 0 or pins > 10: |
| 21 | raise ValueError("Pins must be between 0 and 10") |
| 22 | |
| 23 | # Check if game is already complete |
| 24 | if self.is_game_complete(): |
| 25 | raise IndexError("Game already has 10 frames") |
| 26 | |
| 27 | # Validate frame rules for frames 1-9 |
| 28 | # Simple approach: for frames 1-9, if we have an odd number of rolls, |
| 29 | # and the previous roll wasn't a strike, then this is the second roll in a frame |
| 30 | if len(self.rolls) < 18: # Frames 1-9 (max 18 rolls) |
| 31 | # If we have an odd number of rolls, this is the second roll in a frame |
| 32 | if len(self.rolls) % 2 == 1: |
| 33 | # Check if the previous roll was not a strike |
| 34 | if self.rolls[-1] != 10: # Previous roll wasn't a strike |
| 35 | if self.rolls[-1] + pins > 10: |
| 36 | raise ValueError("Frame cannot have more than 10 pins") |
| 37 | |
| 38 | # Validate 10th frame rules |
| 39 | elif len(self.rolls) >= 18: # 10th frame |
| 40 | # Second roll validation |
| 41 | if len(self.rolls) == 19: # Second roll of 10th frame |
| 42 | first_roll_10th = self.rolls[18] |
| 43 | # If first roll wasn't a strike, sum must not exceed 10 |
| 44 | # If first roll was a strike, second roll can be anything (0-10) |
| 45 | if first_roll_10th != 10 and first_roll_10th + pins > 10: |
| 46 | raise ValueError("Frame cannot have more than 10 pins") |
| 47 | |
| 48 | # Third roll validation (fill ball) |
| 49 | if len(self.rolls) == 20: # Third roll of 10th frame |
| 50 | first_roll_10th = self.rolls[18] |
| 51 | second_roll_10th = self.rolls[19] |
| 52 | |
| 53 | # If we have a third roll, it means we had a strike or spare in 10th frame |
| 54 | tenth_frame_score = first_roll_10th + second_roll_10th |
| 55 | |
| 56 | # If 10th frame was a spare (exactly 10), the fill ball can be 0-10 |
| 57 | if tenth_frame_score == 10: |
| 58 | pass # Any value 0-10 is valid |
| 59 | |
| 60 | # If 10th frame was a strike (first roll was 10) |
| 61 | elif first_roll_10th == 10: |
| 62 | # If second roll wasn't a strike, check sum with third |
| 63 | if second_roll_10th != 10 and second_roll_10th + pins > 10: |
| 64 | raise ValueError("Frame cannot have more than 10 pins") |
| 65 | # If second roll was a strike, third can be anything (0-10) |
| 66 | # This is handled by the general pin validation above |
| 67 | |
| 68 | # If 10th frame was open (less than 10), we shouldn't have a third roll |
| 69 | else: |
| 70 | raise IndexError("cannot throw bonus with an open tenth frame") |
| 71 | |
| 72 | self.rolls.append(pins) |
| 73 | |
| 74 | def _get_current_frame_index(self): |
| 75 | """ |
| 76 | Get the current frame index (0-9). |
| 77 | |
| 78 | Returns: |
| 79 | int: Current frame index. |
| 80 | """ |
| 81 | roll_count = len(self.rolls) |
| 82 | |
| 83 | # For frames 1-9, count strikes as 1 roll, others as 2 rolls |
| 84 | frame_index = 0 |
| 85 | roll_index = 0 |
| 86 | |
| 87 | # Count completed frames 1-9 |
| 88 | while frame_index < 9 and roll_index < roll_count: |
| 89 | if roll_index < len(self.rolls) and self.rolls[roll_index] == 10: # Strike |
| 90 | roll_index += 1 |
| 91 | else: # Open frame or spare |
| 92 | roll_index += 2 |
| 93 | frame_index += 1 |
| 94 | |
| 95 | # If we've counted 9 frames, we're in the 10th frame |
| 96 | if frame_index >= 9: |
| 97 | return 9 |
| 98 | |
| 99 | return frame_index |
| 100 | |
| 101 | def _is_second_roll_in_frame(self, frame_index): |
| 102 | """ |
| 103 | Check if the next roll will be the second roll in the given frame. |
| 104 | |
| 105 | Args: |
| 106 | frame_index (int): Frame index to check. |
| 107 | |
| 108 | Returns: |
| 109 | bool: True if next roll is second roll in frame, False otherwise. |
| 110 | """ |
| 111 | if frame_index >= 9: # 10th frame or beyond |
| 112 | return len(self.rolls) % 2 == 1 if len(self.rolls) < 18 else len(self.rolls) >= 19 |
| 113 | |
| 114 | # For frames 1-9, count how many rolls we've had |
| 115 | roll_index = 0 |
| 116 | for i in range(frame_index): |
| 117 | if roll_index < len(self.rolls) and self.rolls[roll_index] == 10: # Strike |
| 118 | roll_index += 1 |
| 119 | else: # Open frame or spare |
| 120 | roll_index += 2 |
| 121 | |
| 122 | # If we're at an odd position in this frame, it's the second roll |
| 123 | return (len(self.rolls) - roll_index) == 1 |
| 124 | |
| 125 | def is_game_complete(self): |
| 126 | """ |
| 127 | Check if the game is complete. |
| 128 | |
| 129 | Returns: |
| 130 | bool: True if the game is complete, False otherwise. |
| 131 | """ |
| 132 | # Need at least 10 frames worth of rolls |
| 133 | if len(self.rolls) < 10: |
| 134 | return False |
| 135 | |
| 136 | # Count frames properly (strikes count as 1 roll, others as 2) |
| 137 | frame_count = 0 |
| 138 | roll_index = 0 |
| 139 | |
| 140 | # Count frames 1-9 |
| 141 | while frame_count < 9 and roll_index < len(self.rolls): |
| 142 | if self.rolls[roll_index] == 10: # Strike |
| 143 | roll_index += 1 |
| 144 | else: # Open frame or spare |
| 145 | if roll_index + 1 < len(self.rolls): |
| 146 | roll_index += 2 |
| 147 | else: |
| 148 | # Incomplete frame |
| 149 | return False |
| 150 | frame_count += 1 |
| 151 | |
| 152 | # Handle 10th frame |
| 153 | if frame_count == 9: # We're at 10th frame |
| 154 | # Check if we have enough rolls for the 10th frame |
| 155 | remaining_rolls = len(self.rolls) - roll_index |
| 156 | |
| 157 | if remaining_rolls >= 2: |
| 158 | # Check if 10th frame was open (no bonus balls needed) |
| 159 | tenth_frame_score = self.rolls[roll_index] + self.rolls[roll_index + 1] |
| 160 | if tenth_frame_score < 10: |
| 161 | return remaining_rolls == 2 # Open frame needs exactly 2 rolls |
| 162 | else: |
| 163 | # Strike or spare in 10th frame needs bonus balls |
| 164 | if remaining_rolls == 3: |
| 165 | return True # We have all needed rolls |
| 166 | else: |
| 167 | return False # Need more bonus balls |
| 168 | else: |
| 169 | return False # Not enough rolls for 10th frame |
| 170 | |
| 171 | return frame_count >= 10 |
| 172 | |
| 8 | 173 | def score(self): |
| 9 | | pass |
| 174 | """ |
| 175 | Calculate the total score for the game. |
| 176 | |
| 177 | Returns: |
| 178 | int: The total score of the game. |
| 179 | |
| 180 | Raises: |
| 181 | IndexError: If the game is not yet complete. |
| 182 | """ |
| 183 | # Edge Case: Game not complete |
| 184 | if not self.is_game_complete(): |
| 185 | raise IndexError("Game not finished") |
| 186 | |
| 187 | score = 0 |
| 188 | roll_index = 0 |
| 189 | |
| 190 | # Score frames 1-9 |
| 191 | for frame in range(9): |
| 192 | # Strike (first roll of frame is 10) |
| 193 | if self.rolls[roll_index] == 10: |
| 194 | score += 10 + self.rolls[roll_index + 1] + self.rolls[roll_index + 2] |
| 195 | roll_index += 1 |
| 196 | # Spare (sum of two rolls in frame is 10) |
| 197 | elif self.rolls[roll_index] + self.rolls[roll_index + 1] == 10: |
| 198 | score += 10 + self.rolls[roll_index + 2] |
| 199 | roll_index += 2 |
| 200 | # Open frame |
| 201 | else: |
| 202 | score += self.rolls[roll_index] + self.rolls[roll_index + 1] |
| 203 | roll_index += 2 |
| 204 | |
| 205 | # Score 10th frame |
| 206 | # For 10th frame, we just sum all remaining rolls |
| 207 | while roll_index < len(self.rolls): |
| 208 | score += self.rolls[roll_index] |
| 209 | roll_index += 1 |
| 210 | |
| 211 | return score |