[old] Count Inversion

[old] Count Inversion


У комп`ютернiй науці та дискретнiй математицi, інверсія - це пара позицій послідовності, де елементи на цих позиціях випадають з природнього порядку. Таким чином, якщо ми використовуємо порядок за зростанням для групи чисел, то інверсія виходить, коли більші цифри стоять перед меншим значенням в послідовності.

Перевіримо такий приклад послідовності: (1, 2, 5, 3, 4, 7, 6) тут ми можемо бачити три інверсії
- 5 и 3; - 5 и 4; - 7 и 6.

Вам дана послідовність унікальних чисел та ви повинні підрахувати число інверсій в цій послідовності. ...

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