{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "t := \"haystack needle haystack\" // \"text\" - thing we search in\n",
    "p := \"needle\" // \"pattern\" - thing we search for"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "func naive(p, t string) []int {\n",
    "    // assume len(p) <= len(t)\n",
    "    occurrences := []int{}\n",
    "    for i := 0; i < len(t) - len(p) + 1; i++ { // for each alignment of p to t\n",
    "        match := true  // assume we match until proven wrong\n",
    "        for j := 0; j < len(p); j++ { // for each position of p\n",
    "            if t[i+j] != p[j] {\n",
    "                match = false  // at least 1 char mismatches\n",
    "                break\n",
    "            }\n",
    "        }\n",
    "        if match {\n",
    "            occurrences = append(occurrences, i)\n",
    "        }\n",
    "    }\n",
    "    return occurrences\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[9]"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "naive(p, t)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "needle"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "t[9:9+len(p)]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[0 6 12]"
      ]
     },
     "execution_count": 5,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "naive(\"needle\", \"needleneedleneedle\")"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Go",
   "language": "go",
   "name": "gophernotes"
  },
  "language_info": {
   "codemirror_mode": "",
   "file_extension": ".go",
   "mimetype": "",
   "name": "go",
   "nbconvert_exporter": "",
   "pygments_lexer": "",
   "version": "go1.11"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 2
}