hackerrank pairs code dojo with @sranso

Week7.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {
    "collapsed": false
   },
   "outputs": [],
   "source": [
    "some_input = \"1 3 5 6 7\"\n",
    "input_list = list(map(int, some_input.split(\" \")))\n",
    "input_list\n",
    "k = 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": [
    "some_input = \"1 3 5 6 7\"\n",
    "input_set = set(map(int, some_input.split(\" \")))\n",
    "k = 2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 18,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def pairs(k, ls):\n",
    "    counter = 0\n",
    "    ls.sort()\n",
    "    for i, outer in enumerate(ls):\n",
    "        for inner in ls[i+1:]:\n",
    "            if inner-outer == k:\n",
    "                counter += 1\n",
    "                break\n",
    "    return counter\n",
    "pairs(k, input_list)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'abc'"
      ]
     },
     "execution_count": 19,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "ls = 'abc'\n",
    "list(enumerate(ls))\n",
    "ls[0:]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "data": {
      "text/plain": [
       "3"
      ]
     },
     "execution_count": 23,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "def pairs(k, input_set):\n",
    "    counter = 0\n",
    "    for item in input_set:\n",
    "        if item + k in input_set:\n",
    "            counter += 1\n",
    "    return counter\n",
    "pairs(k, input_set)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "5 2\n",
      "1 5 3 4 2\n",
      "3\n"
     ]
    }
   ],
   "source": [
    "first_line = input()\n",
    "k = int(first_line.split(' ')[1])\n",
    "numbers_input = input()\n",
    "numbers_set = set(map(int, numbers_input.split(' ')))\n",
    "print(pairs(k, numbers_set))"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.5.0"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 0
}

Week7.js

function processData(input) {
    function pair(k, set) {
      var count = 0;
      function countPair(value, _value, _set) {
        if ( set.has(value + k) ) {
          count += 1;
        }
      }
      set.forEach(countPair);
      return count;
    }
    
    function toInt(value, _index, _array) {
        return parseInt(value)
    };
    var split = input.split('\n');
    var k = parseInt(split[0].split(' ')[1]);
    var inputSet = new Set(split[1].split(" ").map(toInt));
    var result = pair(k, inputSet);
    return result;
} 

process.stdin.resume();
process.stdin.setEncoding("ascii");
_input = "";
process.stdin.on("data", function (input) {
    _input += input;
});

process.stdin.on("end", function () {
   console.log(processData(_input));
});