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April 2020 - Solution

April 2020 Challenge

We were seeking the answer of Day 19, where writing PT (Ponder This):

```01110111
10110010
11010010
11101000
00010100
10001000
11100010
10000000
```

gives a solution of 0.7000146451.
However, we've also accepted solutions that give ~70.007% after 10 days, such as:

```01101010
10000001
10010010
00101001
10010100
00001010
10100101
01010010
```

Benjamin Lui found a 69.995% solution with only seven vertices:

```0111000
1011110
1100100
1100100
0111011
0100101
0000110
```

Alper Halbutogullari was the first to find a solution that after 19 steps gets to ~70.0000865%:

```01101010
10000001
10010010
00101001
10010100
00001010
10100101
01010010
```

Florian Fischer sent us a drawing (thanks)

Haye Chan found the best approximation (69.999981%) for seven cities and 28 days:

```0000100
0001111
0000111
0100110
1111000
0111000
0110000
```

and Arthur Vause found a solution of 70.000002195% for 9 cities and 34 days:

```000000010
000010101
000101101
001001100
010000011
001100010
011100001
100011000
011010100
```

Thanks to Alok Menghrajani for his writeup.