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                ``` // 帶記憶的遞歸:Fibonacci210802.cpp : 此文件包含 "main" 函數。程序執行將在此處開始并結束。// #include <iostream> #define Max1 1000001 int FaA[Max1]; //unsigned long long tmpn_1; int tmpn_1; int tmpn_2; //unsigned long long tmpn_2; //unsigned long long int Fibonacci(int n) { if (0 == n) return 0; if(2>n) return 1;// if (1 == n) return 1; // if (2 == n) return 1; // if (-1 != FaA[(n-1)]) { tmpn_1 = FaA[n - 1]; } else if (-1==FaA[n-1]) tmpn_1 = Fibonacci((n-1)); // 后面的語句是等價代碼: tmpn_1 = (-1 == FaA[n - 1]) ? Fibonacci(n - 1) : FaA[n - 1]; //此句為前面代碼的等價語句, //只不過此為 “三目”寫法 tmpn_2 = (-1 == FaA[n - 2]) ? Fibonacci(n - 2) : FaA[n - 2]; // if (-1 != FaA[(n - 2) ]) { tmpn_2 = FaA[n - 2]; } else if (-1==FaA[n-2]) tmpn_2 = Fibonacci((n - 2) ); FaA[n] = tmpn_1 + tmpn_2; return ( FaA[n] ); }// int main() { int nn = 9; for (int i = 0; i < Max1; ++i) { FaA[i] = -1; } FaA[0] = 0; FaA[1] = 1; //unsigned long long int tmpull = Fibonacci(nn); for(int ii=0;ii<=nn;++ii ) {//for220i std::cout << "當N為:" << ii << "Fibonacci數為:"; std::cout << FaA[ii] << std::endl; }//for220i std::cout << "當N為:" << nn <<"Fibonacci數為:"; std::cout << tmpull << std::endl; std::cout << "Hello World!\n"; }//main ``` (程序的)**代碼 都是寫給 人類看的……,只不過是剛好計算機可以執行而已。**So,寫代碼既是技術活兒,也是藝術創作…… 前面程序的運行結果: 當N為:0Fibonacci數為:0 當N為:1Fibonacci數為:1 當N為:2Fibonacci數為:1 當N為:3Fibonacci數為:2 當N為:4Fibonacci數為:3 當N為:5Fibonacci數為:5 當N為:6Fibonacci數為:8 當N為:7Fibonacci數為:13 當N為:8Fibonacci數為:21 當N為:9Fibonacci數為:34 當N為:9Fibonacci數為:34 ![](https://img.kancloud.cn/57/25/5725a3c8a79574a966109f07f4e2601d_879x624.webp) 上圖的,紅份色部分的算法就可以稱為“對付法”、對付算法…… 因為算法復雜度實在太高!
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