input = [[i for i in l] for l in open("input.txt", 'r').read().splitlines()] traversed = [] whereami = (0, 0) next = (0,0) for x in range(len(input)): for y in range(len(input[x])): if input[x][y] == 'S': whereami = (x, y) if x > 0 and input[x-1][y] in ['|', '7', 'F']: next = (x-1, y) break if x+1 < len(input) and input[x+1][y] in ['|', 'L', 'J']: next = (x+1, y) break if y > 0 and input[x][y-1] in ['-', 'L', 'F']: next = (x, y-1) break if y+1 < len(input[0]) and input[x][y+1] in ['-', '7', 'J']: next = (x, y+1) break while True: x, y = next traversed.append((x,y)) if input[x][y] == 'F': next = (x+1, y) if whereami == (x,y+1) else (x, y+1) elif input[x][y] == '|': next = (x+1, y) if whereami == (x-1,y) else (x-1, y) elif input[x][y] == '-': next = (x, y+1) if whereami == (x,y-1) else (x, y-1) elif input[x][y] == 'L': next = (x-1, y) if whereami == (x,y+1) else (x, y+1) elif input[x][y] == 'J': next = (x-1, y) if whereami == (x,y-1) else (x, y-1) elif input[x][y] == '7': next = (x+1, y) if whereami == (x,y-1) else (x, y-1) if next in traversed: break whereami = (x, y) print(len(traversed)/2) area = 0 for i in range(len(traversed)-1): area += (traversed[i][1] + traversed[i+1][1]) * (traversed[i][0] - traversed[i+1][0]) area += (traversed[-1][1] + traversed[0][1]) * (traversed[-1][0] - traversed[0][0]) area = abs(area / 2) points = area - len(traversed) / 2 + 1 print(points)