36 lines
760 B
JavaScript
36 lines
760 B
JavaScript
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var grid = require("fs").readFileSync("input.txt").toString().split("\n").map((a)=>(a.split("")));
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var x = 163;
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var y = 0;
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var dirs = [[0, 1], [1, 0], [-1, 0], [0, -1]];
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var dir = 0;
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var visited = [];
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var end = false;
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var letters = [];
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while(!end){
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if(grid[y][x].match("[A-Z]")){
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letters.push(grid[y][x]);
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}
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visited.push((y*201) + x);
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if(grid[y][x] == "+"){
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var changed = false;
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var i = 0;
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while(!changed){
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if(visited.indexOf(((y + dirs[i][1]) * 201) + (x + dirs[i][0])) == -1){
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//not visited before
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if(grid[y+dirs[i][1]][x+dirs[i][0]] != " "){
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//not empty
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changed = true;
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dir = i;
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}
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}
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i++;
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}
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}
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x += dirs[dir][0];
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y += dirs[dir][1];
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if(grid[y][x] == " "){
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end = true;
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}
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}
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console.log(letters.join(""));
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