paizaオンラインハッカソン4 Lite

projectEuler.js

process.stdin.resume();
process.stdin.setEncoding('utf8');

var input_lines = '';

var parseInt10 = function (v) {
  return parseInt(v, 10);
}

process.stdin.on('data', function (chunk) {
  input_lines += chunk;
});

process.stdin.on('end', function () {
  var lines = input_lines.trim().split("\n"),
    p = lines[0].split(" ").map(parseInt10),
    v = lines.slice(1, p[1] + 1).map(parseInt10),
    ans, tmp, i;

  ans = v.slice(0, p[0]).reduce(function (a, b) { return a + b; } );
  for (i = 0, tmp = ans; i < p[1] - p[0]; i++) {
    tmp += v[i+p[0]] - v[i];
    if (ans < tmp) ans = tmp;
  }

  console.log(ans);
});