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算法競賽實(shí)戰(zhàn)筆記 讀者對(duì)象:本書適合對(duì)算法競賽感興趣的青少年閱讀,也可作為相關(guān)領(lǐng)域教師、計(jì)算機(jī)專業(yè)學(xué)生的參考用書。
近年來,隨著互聯(lián)網(wǎng)和人工智能的廣泛應(yīng)用,算法作為其關(guān)鍵技術(shù)的內(nèi)核,備受學(xué)校和企業(yè)的重視,算法競賽更成為算法領(lǐng)域的一顆明珠。本書依托編著者多年算法競賽的教學(xué)積累,全方位介紹了競賽中常用的算法及近年來算法競賽領(lǐng)域最新的研究成果,基于算法競賽中廣泛使用的在線評(píng)測網(wǎng)站——洛谷,著重介紹線性數(shù)據(jù)結(jié)構(gòu),基礎(chǔ)算法,搜索算法,動(dòng)態(tài)規(guī)劃等方面的知識(shí)。本書適合對(duì)算法競賽感興趣的青少年閱讀,也可作為相關(guān)領(lǐng)域教師、計(jì)算機(jī)專業(yè)學(xué)生的參考用書。
作者梁博:2019年至今,負(fù)責(zé)北大附中初中信息學(xué)奧賽教學(xué)工作。2022年學(xué)生成績:入選省隊(duì):陳凱豐,謝梓涵,梁嘉文。北京20個(gè)省隊(duì)名額中占3人。(根據(jù)往年情況,進(jìn)入省隊(duì)基本都可以保送清華或者北大)2021年學(xué)生成績:呂彥哲銀牌。陳凱豐(初二)作為夏令營選手獲得銀牌,簽約北大,成為歷史上簽約北大最小的選手。2020年學(xué)生成績:學(xué)生中初中組(普及組)參賽人數(shù)60人,一等獎(jiǎng)獲獎(jiǎng)20人,二等獎(jiǎng)25人,北京市7個(gè)滿分同學(xué)中占3人。省一等獎(jiǎng)比例30%遠(yuǎn)超全市平局值,總獲獎(jiǎng)率68%初二即有兩名同學(xué)獲得高中組(提高組)一等獎(jiǎng)。2014-2021在小米負(fù)責(zé)簽名與編譯系統(tǒng)研發(fā),科研成果轉(zhuǎn)化為32項(xiàng)專利,如:CN201510549837.6一種應(yīng)用軟件預(yù)裝次數(shù)的控制方法及裝置CN201510547599.5應(yīng)用版本信息的獲取方法、設(shè)備和系統(tǒng)CN201510857770.2終端系統(tǒng)升級(jí)方法及裝置CN201610694577.6數(shù)字簽名方法及裝置其余28項(xiàng)專利不列出,可以在相關(guān)網(wǎng)站檢索到.2009-2021 浙江大學(xué)竺可楨學(xué)院計(jì)算機(jī)科學(xué)與技術(shù)專業(yè)
第 0 章 一些不那么常識(shí)的常識(shí) ············································································.1
0.1 本地編程環(huán)境的配置··············································································.1 0.1.1 在 Windows 系統(tǒng)上安裝使用 Dev C++···············································.1 0.1.2 在 MacOS 系統(tǒng)上安裝 Xcode ··························································.4 0.2 在線評(píng)測系統(tǒng)—洛谷···········································································.7 0.2.1 注冊(cè)洛谷 ···················································································.8 0.2.2 提交題目 ···················································································.9 0.2.3 團(tuán)隊(duì)管理 ···················································································11 第 1 章 線性數(shù)據(jù)結(jié)構(gòu) ························································································15 1.1 數(shù)據(jù)結(jié)構(gòu)·····························································································15 1.1.1 數(shù)據(jù)結(jié)構(gòu)的定義 ··········································································15 1.1.2 數(shù)據(jù)結(jié)構(gòu)的運(yùn)算 ··········································································17 1.1.3 線性數(shù)據(jù)結(jié)構(gòu) ·············································································17 1.2 !ぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁぁ18 1.2.1 棧的定義 ···················································································18 1.2.2 棧的作用 ···················································································20 1.2.3 棧的固定數(shù)組實(shí)現(xiàn) ·······································································21 1.2.4 STL 中的棧 ················································································24 1.2.5 括號(hào)匹配問題 ·············································································26 1.2.6 前綴、中綴、后綴表達(dá)式 ······························································30 1.2.7 后綴表達(dá)式的計(jì)算 ·······································································32 1.2.8 中綴表達(dá)式轉(zhuǎn)換為后綴表達(dá)式 ························································36 1.2.9 中綴表達(dá)式的計(jì)算 ·······································································41 1.3 隊(duì)列···································································································43 1.3.1 隊(duì)列的定義 ················································································44 1.3.2 隊(duì)列的作用 ················································································46 1.3.3 隊(duì)列的固定數(shù)組實(shí)現(xiàn) ····································································46 1.3.4 STL 中的隊(duì)列 ·············································································47 1.3.5 基數(shù)排序(Radix Sorting)·····························································50 1.3.6 結(jié)構(gòu)體的構(gòu)造函數(shù) ·······································································56 1.3.7 隊(duì)列的應(yīng)用 ················································································59 1.4 前綴和·······························································································.66 1.4.1 前綴和的引入 ············································································.66 1.4.2 一維數(shù)組前綴和 ·········································································.66 1.5 動(dòng)態(tài)數(shù)組····························································································.75 1.5.1 動(dòng)態(tài)數(shù)組 vector ··········································································.75 1.5.2 STL 中的動(dòng)態(tài)數(shù)組 ······································································.75 1.5.3 vector 的缺點(diǎn) ·············································································.76 1.5.4 vector 與迭代器 iterator·································································.76 1.5.5 vector 與 C++11 ··········································································.78 1.5.6 vector 的實(shí)現(xiàn)原理 ·······································································.80 1.6 樹·····································································································.82 1.6.1 樹的相關(guān)概念 ············································································.82 1.6.2 樹的性質(zhì) ··················································································.84 1.6.3 特殊的樹—二叉樹 ···································································.84 1.6.4 完全二叉樹的性質(zhì) ······································································.85 1.6.5 樹的存儲(chǔ)方式 ············································································.86 1.6.6 樹的遍歷 ··················································································.89 1.6.7 知二求一 ··················································································101 1.6.8 樹的寬度優(yōu)先遍歷 ······································································105 1.7 本章習(xí)題····························································································105 第 2 章 基礎(chǔ)算法 ·····························································································106 2.1 貪心算法····························································································106 2.1.1 貪心算法的概念 ·········································································106 2.1.2 基礎(chǔ)貪心問題舉例 ······································································107 2.1.3 線段覆蓋問題 ············································································111 2.2 高精度計(jì)算·························································································113 2.2.1 C++語言中的數(shù)據(jù)類型·································································113 2.2.2 高精度加法 ···············································································115 2.2.3 高精度減法 ···············································································118 2.2.4 高精度乘法 ···············································································121 2.2.5 高精度除法取余數(shù) ······································································126 2.3 歸并排序····························································································129 2.3.1 歸并 ························································································130 2.3.2 歸并排序的時(shí)間復(fù)雜度分析 ··························································134 2.3.3 歸并排序的應(yīng)用 ·········································································135 2.4 快速排序··························································································.143 2.4.1 快速排序的思想················································································.143 2.4.2 快速排序的時(shí)間復(fù)雜度分析 ························································.146 2.5 STL ································································································.151 2.5.1 algorithm 頭文件中的函數(shù) ···························································.152 2.5.2 容器 ······················································································.156 2.6 本章習(xí)題··························································································.159 第 3 章 搜索算法 ···························································································.160 3.1 深度優(yōu)先搜索····················································································.160 3.1.1 迷宮尋路與烤雞問題 ·································································.160 3.1.2 全排列問題與回溯 ····································································.166 3.1.3 洪水填充(Flood Fill)算法·························································.168 3.1.4 八皇后問題與剪枝 ····································································.171 3.1.5 數(shù)獨(dú)問題 ················································································.174 3.1.6 剪枝 ······················································································.177 3.2 寬度優(yōu)先搜索····················································································.181 3.2.1 找眼鏡 ···················································································.181 3.2.2 馬的遍歷 ················································································.182 3.2.3 01 迷宮···················································································.185 3.2.4 八數(shù)碼問題 ·············································································.188 3.3 本章習(xí)題··························································································.190 第 4 章 動(dòng)態(tài)規(guī)劃 ···························································································.191 4.1 動(dòng)態(tài)規(guī)劃入門····················································································.191 4.1.1 斐波那契數(shù)列 ··········································································.191 4.1.2 數(shù)字三角形 ·············································································.193 4.1.3 遞推+填表···············································································.195 4.2 動(dòng)態(tài)規(guī)劃解題步驟··············································································.199 4.2.1 分解子問題 ·············································································.199 4.2.2 確定狀態(tài) ················································································.200 4.2.3 狀態(tài)轉(zhuǎn)移 ················································································.200 4.2.4 動(dòng)態(tài)規(guī)劃能解決的問題的特點(diǎn) ·····················································.201 4.3 線性動(dòng)態(tài)規(guī)劃····················································································.201 4.3.1 最長上升子序列問題(LIS)·······················································.201 4.3.2 最長公共子序列問題(LCS)······················································.209 4.4 背包類動(dòng)態(tài)規(guī)劃·················································································.213 4.4.1 01 背包問題···············································································213 4.4.2 多重背包問題 ············································································225 4.4.3 完全背包問題 ············································································228 4.4.4 分組背包問題 ············································································231 4.4.5 二維費(fèi)用背包問題 ······································································241 4.5 區(qū)間動(dòng)態(tài)規(guī)劃與多維動(dòng)態(tài)規(guī)劃·············································································243 4.5.1 區(qū)間動(dòng)態(tài)規(guī)劃 ············································································243 4.5.2 多維動(dòng)態(tài)規(guī)劃 ············································································248 4.6 本章習(xí)題····························································································256
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