gistfile1.txt

let russianDoll = (envelopes) => {
  let maxCount = 0;
  let indicesUsed = {};
  let russianRecurse = (currentCount = 0, lastEnv = [-Infinity, -Infinity]) => {
    if (currentCount > maxCount) {
      maxCount = currentCount;
    }
    envelopes.forEach((envelope, index) => {
      if (!indicesUsed[index] && envelope[0] > lastEnv[0] && envelope[1] > lastEnv[1]) {
        indicesUsed[index] = true;
        russianRecurse(currentCount + 1, envelope);
        delete indicesUsed[index];
      }
    });
  };
  russianRecurse();
  return maxCount;
};