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golf-results-2020-summer

highscore.png

Task

Rules

  • The program performs a simulation of an epidemic simulation and prints ASCII's map of people (see examples).
  • The output must be printed to STDOUT.
  • The output must have a newline char (\n) at the end.
  • Program gets 2 arguments (argv)
  • Arguments are always valid.
  • First argument K is an integer defining the number of iterations.
  • Second argument is a string representing the population separated with commas (see description of the XYSQ code below).
  • Each line must have newline char (\n) at the end.
  • The last line must not have any characters after newline char (\n).

Description

Inspiration for this golf is another simulation created by Washington Post (https://www.washingtonpost.com/graphics/2020/world/corona-simulator/).

The goal of this golf is to create a simulation of a virus spreading across the population.

$ ./task 10 22H0,33S0
........
........
........
.S......
....S...
........
........
........

The area is always 8x8 size.

Each person is described with the XYSQ code, where:

  • X - position in X axis, from 0 to 7;
  • Y - position in Y axis, from 0 to 7;
  • S - State of the person, we have 3 states:
    • H - Healthy person, can be infected;
    • S - Sick person, can infect healthy person and after 14 iterations changes to R state;
    • R - Recovered person, cannot be infected;
  • Q - Quarantine state, 0 or 1, if Q is 1< then the person can't move;
  • Additionaly, the person has a hidden N value - it's a grain for random moving (please see step flow). Initial value is n = (x &lt;&lt; 2)^7 * (y &lt;&lt; 3)^5 where:
    • << is a bit shift
    • ^ is a XOR operation

Step flow

function next_iteration(P) {
    for (person in P) { // iterate in a sequence
        person.s = cure(person.s)
        person.n = gen_n(person.n)
        [new_x, new_y] = gen_new_cords(person)
        if (point {new_x, new_y} is free and person.q == 0) { 
            person.x = new_x
            person.y = new_y
        }
        if (person.s == H and in the neightbourhood (use Moore) is a sick individual) {
            // https://en.wikipedia.org/wiki/Moore_neighborhood
            person.s = S
        }
    }
}

function cure(state) {
    if (state == S and 14 iterations has passed since the individual got sick) {
        return R
    } else {
        return state
    }
}

function gen_n(n) {
    n ^= n << 13
    n ^= n >> 17
    n ^= n << 5
    return n % (1 << 30)
}

function gen_new_cords(person) {
    x = person.x
    y = person.y
    switch(person.n modulo 4) {
        case 0: x += 1
        case 1: x -= 1
        case 2: y += 1
        case 3: y -= 1
    }
    // wrap points, like in pacman game
    if (x >= WIDTH)  x -= WIDTH  else if (x < 0) x += WIDTH
    if (y >= HEIGHT) y -= HEIGHT else if (y < 0) y += HEIGHT
    return [x, y]
}

Examples

$ ./task 1 25H0,32S0,46R1,63H1,76S1
........
........
........
...S..H.
........
...H....
....R..S
........
$ ./task 2 25H0,32S0,46R1,63H1,76S1
........
........
........
....S.H.
...S....
........
....R..S
........
$ ./task 14 25H0,32S0,46R1,63H1,76S1
.R......
........
........
......S.
.......S
........
....R..R
........
$ ./task 20 25H0,32S0,46R1,63H1,76S1
.R......
........
........
......RR
........
........
....R..R
........

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