| 1 | 1 | class BowlingGame: |
| 2 | 2 | def __init__(self): |
| 3 | | pass |
| 4 | | |
| 3 | """ |
| 4 | Initialize a new bowling game. |
| 5 | """ |
| 6 | self.rolls = [] |
| 7 | self.current_roll = 0 |
| 8 | |
| 5 | 9 | def roll(self, pins): |
| 6 | | pass |
| 7 | | |
| 10 | """ |
| 11 | Record a roll in the game. |
| 12 | |
| 13 | Args: |
| 14 | pins (int): Number of pins knocked down in this roll. |
| 15 | |
| 16 | Raises: |
| 17 | ValueError: If the number of pins is invalid. |
| 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 | # Edge Case: Too many pins in a frame (only for frames 1-9 and first two rolls of 10th frame) |
| 24 | if self._is_second_roll_in_frame() and self.rolls[-1] + pins > 10: |
| 25 | raise ValueError("Cannot knock down more than 10 pins in a frame") |
| 26 | |
| 27 | # Edge Case: Game already complete |
| 28 | if self._is_game_complete(): |
| 29 | raise IndexError("Game has already ended") |
| 30 | |
| 31 | self.rolls.append(pins) |
| 32 | self.current_roll += 1 |
| 33 | |
| 8 | 34 | def score(self): |
| 9 | | pass |
| 35 | """ |
| 36 | Calculate the total score for the game. |
| 37 | |
| 38 | Returns: |
| 39 | int: The total score for the game. |
| 40 | |
| 41 | Raises: |
| 42 | ValueError: If the game is not yet complete. |
| 43 | """ |
| 44 | # Edge Case: Game not complete |
| 45 | if not self._is_game_complete(): |
| 46 | raise IndexError("Game is not yet complete") |
| 47 | |
| 48 | score = 0 |
| 49 | roll_index = 0 |
| 50 | |
| 51 | # Process frames 1-9 |
| 52 | for frame in range(9): |
| 53 | # Edge Case: Strike |
| 54 | if self._is_strike(roll_index): |
| 55 | score += 10 + self._strike_bonus(roll_index) |
| 56 | roll_index += 1 |
| 57 | # Edge Case: Spare |
| 58 | elif self._is_spare(roll_index): |
| 59 | score += 10 + self._spare_bonus(roll_index) |
| 60 | roll_index += 2 |
| 61 | # Edge Case: Open frame |
| 62 | else: |
| 63 | score += self.rolls[roll_index] + self.rolls[roll_index + 1] |
| 64 | roll_index += 2 |
| 65 | |
| 66 | # Process frame 10 (special case) |
| 67 | if self._is_strike(roll_index): |
| 68 | # Strike in 10th frame |
| 69 | score += 10 + self.rolls[roll_index + 1] + self.rolls[roll_index + 2] |
| 70 | elif self._is_spare(roll_index): |
| 71 | # # Spare in 10th frame |
| 72 | score += 10 + self.rolls[roll_index + 2] |
| 73 | else: |
| 74 | # # Open frame in 10th frame |
| 75 | score += self.rolls[roll_index] + self.rolls[roll_index + 1] |
| 76 | |
| 77 | return score |
| 78 | |
| 79 | def _is_game_complete(self): |
| 80 | """ |
| 81 | Check if the game is complete. |
| 82 | |
| 83 | Returns: |
| 84 | bool: True if the game is complete, False otherwise. |
| 85 | """ |
| 86 | # Need at least 10 rolls to have a complete game |
| 87 | if len(self.rolls) < 10: |
| 88 | return False |
| 89 | |
| 90 | # Count frames to determine game completion |
| 91 | frame_count = 0 |
| 92 | roll_index = 0 |
| 93 | |
| 94 | # Count frames 1-9 |
| 95 | while frame_count < 9 and roll_index < len(self.rolls): |
| 96 | if roll_index >= len(self.rolls): |
| 97 | return False |
| 98 | |
| 99 | if self.rolls[roll_index] == 10: # Strike |
| 100 | roll_index += 1 |
| 101 | else: # Open frame or spare |
| 102 | if roll_index + 1 >= len(self.rolls): |
| 103 | return False |
| 104 | roll_index += 2 |
| 105 | frame_count += 1 |
| 106 | |
| 107 | # If we haven't completed 9 frames, game is not complete |
| 108 | if frame_count < 9: |
| 109 | return False |
| 110 | |
| 111 | # We're in the 10th frame |
| 112 | remaining_rolls = len(self.rolls) - roll_index |
| 113 | |
| 114 | # If no rolls in 10th frame, game is not complete |
| 115 | if remaining_rolls == 0: |
| 116 | return False |
| 117 | |
| 118 | # Get first roll of 10th frame |
| 119 | first_roll = self.rolls[roll_index] |
| 120 | |
| 121 | if first_roll == 10: # Strike in 10th frame |
| 122 | # Need exactly 3 rolls (strike + 2 fill balls) |
| 123 | return remaining_rolls == 3 |
| 124 | else: |
| 125 | # Not a strike |
| 126 | if remaining_rolls == 2: |
| 127 | # Check if we have a complete 10th frame |
| 128 | if roll_index + 1 < len(self.rolls): |
| 129 | second_roll = self.rolls[roll_index + 1] |
| 130 | if first_roll + second_roll == 10: # Spare |
| 131 | return False # Spare needs a fill ball |
| 132 | else: # Open frame |
| 133 | return True # Open frame is complete |
| 134 | else: |
| 135 | return False |
| 136 | elif remaining_rolls == 3: |
| 137 | # Must be a spare with fill ball |
| 138 | if roll_index + 1 < len(self.rolls): |
| 139 | second_roll = self.rolls[roll_index + 1] |
| 140 | return first_roll + second_roll == 10 # Complete only if it's a spare |
| 141 | else: |
| 142 | return False |
| 143 | else: |
| 144 | return False # Wrong number of rolls |
| 145 | |
| 146 | return False |
| 147 | |
| 148 | def _is_strike(self, roll_index): |
| 149 | """ |
| 150 | Check if a roll is a strike. |
| 151 | |
| 152 | Args: |
| 153 | roll_index (int): Index of the roll to check. |
| 154 | |
| 155 | Returns: |
| 156 | bool: True if the roll is a strike, False otherwise. |
| 157 | """ |
| 158 | return self.rolls[roll_index] == 10 |
| 159 | |
| 160 | def _is_spare(self, roll_index): |
| 161 | """ |
| 162 | Check if a frame is a spare. |
| 163 | |
| 164 | Args: |
| 165 | roll_index (int): Index of the first roll in the frame. |
| 166 | |
| 167 | Returns: |
| 168 | bool: True if the frame is a spare, False otherwise. |
| 169 | """ |
| 170 | return self.rolls[roll_index] + self.rolls[roll_index + 1] == 10 |
| 171 | |
| 172 | def _strike_bonus(self, roll_index): |
| 173 | """ |
| 174 | Calculate the bonus for a strike. |
| 175 | |
| 176 | Args: |
| 177 | roll_index (int): Index of the strike roll. |
| 178 | |
| 179 | Returns: |
| 180 | int: The bonus points for the strike. |
| 181 | """ |
| 182 | return self.rolls[roll_index + 1] + self.rolls[roll_index + 2] |
| 183 | |
| 184 | def _spare_bonus(self, roll_index): |
| 185 | """ |
| 186 | Calculate the bonus for a spare. |
| 187 | |
| 188 | Args: |
| 189 | roll_index (int): Index of the first roll in the spare frame. |
| 190 | |
| 191 | Returns: |
| 192 | int: The bonus points for the spare. |
| 193 | """ |
| 194 | return self.rolls[roll_index + 2] |
| 195 | |
| 196 | def _is_second_roll_in_frame(self): |
| 197 | """ |
| 198 | Check if the current roll is the second roll in a frame. |
| 199 | |
| 200 | Returns: |
| 201 | bool: True if the current roll is the second roll in a frame, False otherwise. |
| 202 | """ |
| 203 | # For the first roll, it's never the second roll in a frame |
| 204 | if self.current_roll == 0: |
| 205 | return False |
| 206 | |
| 207 | # Count frames to determine where we are |
| 208 | frame_count = 0 |
| 209 | roll_index = 0 |
| 210 | |
| 211 | # Process frames 1-9 |
| 212 | while frame_count < 9 and roll_index < len(self.rolls): |
| 213 | if self.rolls[roll_index] == 10: # Strike |
| 214 | # If we're checking the current roll position |
| 215 | if roll_index + 1 == self.current_roll: |
| 216 | return False # First roll of a new frame |
| 217 | roll_index += 1 |
| 218 | else: # Open frame or spare |
| 219 | # If we're checking the current roll position |
| 220 | if roll_index + 1 == self.current_roll: |
| 221 | return True # Second roll of current frame |
| 222 | elif roll_index + 2 == self.current_roll: |
| 223 | return False # First roll of a new frame |
| 224 | roll_index += 2 |
| 225 | frame_count += 1 |
| 226 | |
| 227 | # We're in the 10th frame |
| 228 | # In the 10th frame, fill balls don't need validation |
| 229 | # Only validate the first two rolls of the 10th frame |
| 230 | # Add 1 because self.current_roll is 0-indexed but we want to count actual rolls |
| 231 | rolls_in_tenth_frame = (self.current_roll + 1) - roll_index |
| 232 | |
| 233 | # In the 10th frame: |
| 234 | # - 1 roll: First roll of 10th frame (no validation needed) |
| 235 | # - 2 rolls: Second roll of 10th frame (needs validation ONLY if first roll wasn't a strike) |
| 236 | # - 3+ rolls: Fill balls (no validation needed) |
| 237 | |
| 238 | # For fill balls (3rd roll and beyond in 10th frame), no validation |
| 239 | if rolls_in_tenth_frame >= 3: |
| 240 | return False |
| 241 | |
| 242 | # For second roll in 10th frame, validate only if first roll wasn't a strike |
| 243 | if rolls_in_tenth_frame == 2: |
| 244 | # Check if first roll in 10th frame was a strike |
| 245 | first_roll_in_tenth = self.rolls[roll_index] |
| 246 | if first_roll_in_tenth == 10: |
| 247 | return False # Second roll after strike in 10th frame is a fill ball, no validation |
| 248 | return True # Second roll in regular 10th frame, needs validation |
| 249 | |
| 250 | return False |
| 251 | |
| 252 | # Handled Edge Cases: Invalid pin count, too many pins in a frame, game already complete, game not complete, tenth frame is open, tenth frame is spare or strike |
| 253 | # Handled Edge Cases: Invalid pin count, game already complete |
| 254 | # Handled Edge Cases: Game not complete |
| 255 | # Handled Edge Cases: Not enough rolls, tenth frame is open, tenth frame is spare or strike |
| 256 | # Handled Edge Cases: Strike in frames 1-9, Spare in frames 1-9, Open frame in frames 1-9 |