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g0501_0600.s0517_super_washing_machines.readme.md Maven / Gradle / Ivy

517\. Super Washing Machines

Hard

You have `n` super washing machines on a line. Initially, each washing machine has some dresses or is empty.

For each move, you could choose any `m` (`1 <= m <= n`) washing machines, and pass one dress of each washing machine to one of its adjacent washing machines at the same time.

Given an integer array `machines` representing the number of dresses in each washing machine from left to right on the line, return _the minimum number of moves to make all the washing machines have the same number of dresses_. If it is not possible to do it, return `-1`.

**Example 1:**

**Input:** machines = [1,0,5]

**Output:** 3

**Explanation:** 1st move: 1 0 <-- 5 => 1 1 4 2nd move: 1 <-- 1 <-- 4 => 2 1 3 3rd move: 2 1 <-- 3 => 2 2 2

**Example 2:**

**Input:** machines = [0,3,0]

**Output:** 2

**Explanation:** 1st move: 0 <-- 3 0 => 1 2 0 2nd move: 1 2 --> 0 => 1 1 1

**Example 3:**

**Input:** machines = [0,2,0]

**Output:** -1

**Explanation:** It's impossible to make all three washing machines have the same number of dresses.

**Constraints:**

*   `n == machines.length`
*   1 <= n <= 104
*   0 <= machines[i] <= 105