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Each item ID is an alphanumeric word. All IDs are unique. Input: Line 1 contains one integer N, where N is the number of items in the entire collection (including the missing item). This is followed by N lines, representing the original collection. Each line only consists of an item ID. This is followed by another N-1 lines, representing the collection after removing one item. Each line consists of an item ID. Output: The item ID of the missing item. Limits: Subtask 1-4 Memory Limit: 24MB Subtask 5-6 Memory Limit: 4MB Subtasks: Subtask 1 (5%): Numeric IDs only, N <= 10^4, maxID <= 16 million Subtask 2 (5%): Numeric IDs only, N <= 10^6, maxID <= 16 million Subtask 3 (10%): Numeric IDs only, N <= 10^6, maxID <= 64 million Subtask 4 (25%): Numeric IDs only, N <= 10^6, maxID <= 2^32-1 Subtask 5 (30%): Numeric IDs only, N <= 10^6, maxID <= 2^32-1 Subtask 6 (25%): Alphanumeric IDs, N <= 10^6, max ID length <= 10 characters Subtask 7 (0%): Sample Testcases Sample Input 1: 9 41 37 34 30 20 13 100 4 55 13 30 55 37 41 4 34 20 Sample Output 1: 100 Sample Input 2: 8 40 39 27 88 42 14 94 63 40 27 88 63 14 42 94 Sample Output 2: 39 Sample Input 3: 10 9 93 100 30 6 85 13 83 51 34 6 13 30 9 34 100 85 93 51 Sample Output 3: 83

### Tags

### Subtasks and Limits

Subtask | Score | #TC | Time | Memory | Scoring |
---|---|---|---|---|---|

1 | 5 | 15 | 2s | 24MB | Minimum |

2 | 5 | 15 | 2s | 24MB | Minimum |

3 | 10 | 15 | 2s | 24MB | Minimum |

4 | 25 | 15 | 2s | 24MB | Minimum |

5 | 30 | 15 | 2s | 4MB | Minimum |

6 | 25 | 15 | 2s | 4MB | Minimum |

7 | 0 | 3 | 2s | 24MB | Minimum |

### Judge Compile Command

g++-8 ans.cpp -o missing -Wall -Wshadow -static -O2 -lm -m64 -s -w -std=gnu++17 -fmax-errors=512