018.js

javascript


var digits = "75\n\
95 64\n\
17 47 82\n\
18 35 87 10\n\
20 04 82 47 65\n\
19 01 23 75 03 34\n\
88 02 77 73 07 63 67\n\
99 65 04 28 06 16 70 92\n\
41 41 26 56 83 40 80 70 33\n\
41 48 72 33 47 32 37 16 94 29\n\
53 71 44 65 25 43 91 52 97 51 14\n\
70 11 33 28 77 73 17 78 39 68 17 57\n\
91 71 52 38 17 14 91 43 58 50 27 29 48\n\
63 66 04 68 89 53 67 30 73 16 69 87 40 31\n\
04 62 98 27 23 09 70 98 73 93 38 53 60 04 23";


var lines = digits.split("\n");
var dics  = [];
for(var i = 0; i < lines.length; i++){
  var line = lines[i];
  var nums = line.split(" ");
  dics.push(nums);
}

var f = function(i, pos, total){
  if(i >= dics.length){
    return total;
  }
  total += parseInt(dics[i][pos]);

  var ret1 = f(i + 1, pos, total);
  var ret2 = f(i + 1, pos + 1, total);

  if(ret1 > ret2){
    return ret1;
  }else{
    return ret2;
  }
}

var ret = f(0, 0, 0);
console.log(ret);
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