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g1901_2000.s1921_eliminate_maximum_number_of_monsters.readme.md Maven / Gradle / Ivy

1921\. Eliminate Maximum Number of Monsters

Medium

You are playing a video game where you are defending your city from a group of `n` monsters. You are given a **0-indexed** integer array `dist` of size `n`, where `dist[i]` is the **initial distance** in kilometers of the ith monster from the city.

The monsters walk toward the city at a **constant** speed. The speed of each monster is given to you in an integer array `speed` of size `n`, where `speed[i]` is the speed of the ith monster in kilometers per minute.

You have a weapon that, once fully charged, can eliminate a **single** monster. However, the weapon takes **one minute** to charge.The weapon is fully charged at the very start.

You lose when any monster reaches your city. If a monster reaches the city at the exact moment the weapon is fully charged, it counts as a **loss**, and the game ends before you can use your weapon.

Return _the **maximum** number of monsters that you can eliminate before you lose, or_ `n` _if you can eliminate all the monsters before they reach the city._

**Example 1:**

**Input:** dist = [1,3,4], speed = [1,1,1]

**Output:** 3

**Explanation:** 

In the beginning, the distances of the monsters are [1,3,4]. You eliminate the first monster. 

After a minute, the distances of the monsters are [X,2,3]. You eliminate the second monster. 

After a minute, the distances of the monsters are [X,X,2]. You eliminate the thrid monster.

All 3 monsters can be eliminated.

**Example 2:**

**Input:** dist = [1,1,2,3], speed = [1,1,1,1]

**Output:** 1

**Explanation:** 

In the beginning, the distances of the monsters are [1,1,2,3]. You eliminate the first monster. 

After a minute, the distances of the monsters are [X,0,1,2], so you lose. You can only eliminate 1 monster.

**Example 3:**

**Input:** dist = [3,2,4], speed = [5,3,2]

**Output:** 1

**Explanation:** 

In the beginning, the distances of the monsters are [3,2,4]. You eliminate the first monster. 

After a minute, the distances of the monsters are [X,0,2], so you lose. You can only eliminate 1 monster.

**Constraints:**

*   `n == dist.length == speed.length`
*   1 <= n <= 105
*   1 <= dist[i], speed[i] <= 105