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‎codingtest_review/chpt8_dp.ipynb

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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": 9,
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"id": "fda0140f",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"3000\n",
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"7\n"
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]
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}
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],
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"source": [
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"# actual 2 ) 1로 만들기\n",
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"def sol(n):\n",
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" ans = 0\n",
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" \n",
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" mem = [0]*(n+1)\n",
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" \n",
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" for i in range(2, n+1):\n",
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" if i % 5 == 0:\n",
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" mem[i] = min(mem[i//5], mem[i-1])+1\n",
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" elif i % 3 == 0:\n",
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" mem[i] = min(mem[i//3], mem[i-1])+1\n",
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" elif i % 2 == 0:\n",
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" mem[i] = min(mem[i//2], mem[i-1])+1\n",
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" else:\n",
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" mem[i] = mem[i-1]+1\n",
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" \n",
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" ans = mem[n]\n",
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" return ans\n",
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"\n",
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"\n",
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"n = int(input())\n",
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"\n",
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"print(sol(n))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"id": "03d2d5cc",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"3000\n",
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"7\n"
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]
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}
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],
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"source": [
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"# actual 2 ) 1로 만들기 in book\n",
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"def sol(n):\n",
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" ans = 0\n",
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" \n",
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" mem = [0]*(n+1)\n",
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" \n",
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" for i in range(2, n+1):\n",
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" mem[i] = mem[i-1]+1\n",
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" \n",
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" if i % 5 == 0:\n",
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" mem[i] = min(mem[i//5]+1, mem[i])\n",
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" elif i % 3 == 0:\n",
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" mem[i] = min(mem[i//3]+1, mem[i])\n",
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" elif i % 2 == 0:\n",
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" mem[i] = min(mem[i//2]+1, mem[i])\n",
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" \n",
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" ans = mem[n]\n",
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" return ans\n",
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"\n",
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"\n",
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"n = int(input())\n",
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"\n",
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"print(sol(n))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 13,
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"id": "52b71023",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"1 3 1 5\n",
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"[1, 3, 1, 5]\n",
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"8\n"
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]
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}
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],
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"source": [
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"def sol(arr):\n",
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" ans = 0\n",
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" d = [0]*len(arr)\n",
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" \n",
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" d[0] = arr[0]\n",
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" d[1] = max(arr[0], arr[1])\n",
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" \n",
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" for i in range(2, len(arr)):\n",
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" d[i] = max(d[i-1], d[i-2]+arr[i])\n",
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" \n",
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" print(arr)\n",
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" \n",
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" ans = d[len(arr)-1]\n",
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" return ans\n",
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"\n",
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"\n",
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"arr = list(map(int, input().split()))\n",
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"print(sol(arr))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 25,
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"id": "4723c42d",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"3\n",
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"[0, 1, 3, 5]\n",
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"5\n"
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]
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}
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],
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"source": [
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"# actual 4 ) 바닥 공사\n",
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"\n",
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"def sol(n):\n",
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" ans = 0\n",
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" d = [0]*1001\n",
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" \n",
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" d[1] = 1\n",
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" d[2] = 3\n",
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" for i in range(3, n+1):\n",
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" d[i] = d[i-1] + d[i-2]*2\n",
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" \n",
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" print(d[:4])\n",
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" ans = d[n]\n",
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" \n",
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" return ans\n",
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"\n",
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"\n",
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"n = int(input())\n",
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"print(sol(n))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 32,
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"id": "51cb122c",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"2 15\n",
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"2\n",
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"3\n",
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"[99999, 99999, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5]\n",
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"5\n"
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]
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}
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],
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"source": [
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"# actual 5 ) 효율적인 화폐 구성\n",
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"\n",
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"def sol(arr, m):\n",
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" INF = 99999\n",
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" d = [INF]*(m+1)\n",
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" \n",
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" arr.sort()\n",
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" \n",
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" for i in arr:\n",
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" d[i] = 1\n",
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" \n",
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" for i in range(min(arr), m+1):\n",
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" res = INF\n",
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" for j in arr:\n",
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" if d[i-j] > 0:\n",
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" res = min(res, d[i-j]+1)\n",
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" if res != INF:\n",
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" d[i] = res\n",
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" print(d)\n",
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" if d[m] == INF:\n",
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" return -1\n",
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" else:\n",
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" return d[m]\n",
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" \n",
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"\n",
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"n, m = map(int, input().split())\n",
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"arr = []\n",
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"for i in range(n):\n",
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" arr.append(int(input()))\n",
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" \n",
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"print(sol(arr, m))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "7406c998",
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"metadata": {},
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"outputs": [],
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"source": [
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"# # actual 5 ) 효율적인 화폐 구성\n",
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"\n",
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"# def sol(arr, m):\n",
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"# INF = 99999\n",
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"# d = [INF]*(m+1)\n",
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" \n",
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"# arr.sort()\n",
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" \n",
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"# for i in arr:\n",
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"# d[i] = 1\n",
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" \n",
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"# for i in range(arr[0], m+1):\n",
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" \n",
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"# print(d)\n",
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"# if d[m] == INF:\n",
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"# return -1\n",
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"# else:\n",
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"# return d[m]\n",
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" \n",
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"\n",
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"# n, m = map(int, input().split())\n",
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"# arr = []\n",
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"# for i in range(n):\n",
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"# arr.append(int(input()))\n",
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" \n",
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"# print(sol(arr, m))"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"id": "028b9aba",
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"metadata": {},
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"outputs": [],
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"source": [
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n",
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"\n"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3 (ipykernel)",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.10.0"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 5
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}

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