Codeforces-April Fools Day Contest 2020-E-图片坐标_april fools day contest 2021 a

这是我做的图片（Codeforces@LetMeFly）

做了一张有坐标的图片，可能会帮助你解答E题
Having a picture with coordinates may help you solve E problem

E. Jordan Smiley
time limit per test1 second
memory limit per test256 megabytes
inputstandard input
outputstandard output

Input
The input contains two integers row, col (0≤row,col≤63), separated by a single space.

Output
Output “IN” or “OUT”.

（这是题目的图片）
Examples
input
0 0
output
OUT
input
27 0
output
IN
input
0 27
output
OUT
input
27 27
output
IN

其实就是判断一个点的坐标在不在封闭图形内。

外国大神的评论以及代码是：（Codeforces@brezhart）
First: fill area in photoshop

Second: Do 2d dimension arr. Check pixel at (i15)+5 (g15)+5. If it’s white, put 0 in arr else put 1; Save that arr in file for use it in final solution. I picked Node.JS for this step.

var fs = require("fs");
var Canvas = require("canvas");

let fileLink = "smile.png";
var canvas = new Canvas.Canvas(960, 960, "png");
var ctx = canvas.getContext("2d");

const Image = Canvas.Image;
var image = new Image(963,964);
dataArr = [];
image.onload = function () {
    ctx.drawImage(image,-2,-2,963,964);
    for (let i = 0; i < 64; i++){
        let newStr = [];
        for (let g = 0; g < 64; g++){
            var p = ctx.getImageData((g*15)+4, (i*15)+4, 1, 1).data;
            if (p[2] < 240){
                newStr.push(0)
            } else {
                newStr.push(1)
            }
        }
        dataArr.push(newStr)
    }
    fs.writeFileSync("DATAOUT.txt",JSON.stringify(dataArr))
};
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

image.src = fileLink;
Final solution: just get row and col and check arr[row][col] if it’s 0 print “OUT” else print “IN”

这需要时间啊 ^…………