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\u7b97\u6cd5\u7ec3\u4e60 Leetcode \u529b\u6263 322. Coin Change \u89e3\u6cd5<\/a><\/blockquote><\/iframe><script type=\"text\/javascript\">\n\/*! This file is auto-generated *\/\n!function(c,d){\"use strict\";var e=!1,o=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(\/[^a-zA-Z0-9]\/.test(t.secret));else{for(var r,s,a,i=d.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),n=d.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),o=new RegExp(\"^https?:$\",\"i\"),l=0;l<n.length;l++)n[l].style.display=\"none\";for(l=0;l<i.length;l++)if(r=i[l],e.source!==r.contentWindow);else{if(r.removeAttribute(\"style\"),\"height\"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if(\"link\"===t.message)if(s=d.createElement(\"a\"),a=d.createElement(\"a\"),s.href=r.getAttribute(\"src\"),a.href=t.value,!o.test(a.protocol));else if(a.host===s.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener(\"message\",c.wp.receiveEmbedMessage,!1),d.addEventListener(\"DOMContentLoaded\",t,!1),c.addEventListener(\"load\",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf(\"MSIE 10\"),a=!!navigator.userAgent.match(\/Trident.*rv:11\\.\/),i=d.querySelectorAll(\"iframe.wp-embedded-content\"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute(\"data-secret\")))r=Math.random().toString(36).substr(2,10),t.src+=\"#?secret=\"+r,t.setAttribute(\"data-secret\",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute(\"security\"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:\"ready\",secret:r},\"*\")}}}}(window,document);\n<\/script>\n","thumbnail_url":"https:\/\/feellikelearning.com\/wp-content\/uploads\/2020\/04\/blog-covers.020.jpeg","thumbnail_width":1920,"thumbnail_height":1080,"description":"\u9898\u76ee\u5728\u8fd9\u91cc\u3002 \u81ea\u5df1\u60f3\u7684\u7b54\u6848\uff0cbottom up dp\u4e0d\u592a\u597d\u60f3\uff0c\u4ecetop down + cache\u5f00\u59cb\uff0c\u5199\u4e86\u51e0\u6b21\uff0c\u6bcf\u6b21\u7b80\u5316\u4e00\u70b9\uff0c\u6700\u7ec8\u5199\u6210\u8fd9\u6837\u901a\u8fc7OJ\u3002 Python \u7248\u672c\u3002 \u4e3a\u4e86\u66f4\u597d\u7406\u89e3\u7b97\u6cd5\uff0c\u52a0\u4e86\u4e9blog\uff0c\u8bb0\u5f55dfs\u88abcall\u4e86\u51e0\u6b21\u548ccache hit\uff0c\u548c\u6bcf\u4e2acache key\u88ab\u5199\u5165\u6b21\u6570\uff08\u4f7f\u7528cache\u548c\u4e0d\u7528cache\u7684\u60c5\u51b5\u3002 \u7528coins = [1, 2, 5]\u548camount = 11\u4e3a\u4f8b\u5b50 \u7528\u4e86cache \u4e0d\u7528cache \u8fd0\u884c\u5b8c\u540ecache\u7684\u5185\u5bb9\u5982\u4e0b \u6b63\u662f\u4ece0\u523011\u6bcf\u4e2aamount\u7684\u6700\u5c11\u786c\u5e01\u6570\u3002\u4ece\u6b64\u51fa\u53d1\uff0c\u60f3\u5230bottom up dp\u6b63\u662f\u9700\u8981\u6784\u5efa\u5982\u4e0acache\u7684\u5185\u5bb9\u3002dp[0] = 0\uff0camount\u662f0\uff0c\u5f53\u7136\u4e00\u4e2a\u786c\u5e01\u4e0d\u7528\u3002dp[amount]\u5c31\u770bamount – coin\u503c\u662f\u4e0d\u662f\u6b63\uff0c\u800c\u4e14\u4e4b\u524d\u662f\u5426\u6709\u975e-1\u7684\u503c\u3002\u5f53\u7b97\u5230amount\u7684\u65f6\u5019\uff0c\u524d\u9762dp[0]\u5230d][amount-coin]\u90fd\u7b97\u8fc7\u4e86\u3002\u5bf9\u6240\u6709\u7684coin\u503c\u90fd\u7b97\u4e00\u904d\uff0c\u628a\u6240\u6709dp[amount – coin]\u7684\u975e-1\u6700\u5c0f\u503c\u627e\u51fa\u6765\uff0c\u52a01\uff0c\u5c31\u662fdp[amount]\u3002\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(amount * len(coins))\u3002\u7a7a\u95f4\u4e3a O(amount)\u3002 \u8fc7\u4e86\u591a\u65e5\u4ee5\u540e\u81ea\u5df1\u91cd\u65b0\u60f3\u7684Python\u5199\u6cd5, \u770b\u770b\u662f\u5426\u5df2\u7ecf\u5185\u5316\u5e76\u638c\u63e1. \u5bf9\u6bd4\u4e0a\u9762, \u505a\u4e86\u4e00\u4e9b\u6539\u8fdb, dp list...Read more"}