c++ - 创建霍夫曼树，出现了这个错误，如何解决？

Question

我用的是clion编辑器

/Applications/CLion.app/Contents/bin/cmake/bin/cmake --build /Users/guchenghao/Library/Caches/CLion2016.1/cmake/generated/DataStructure_Huffman-c73727c9/c73727c9/Debug --target DataStructure_Huffman -- -j 4
[ 33%] Linking CXX executable DataStructure_Huffman
duplicate symbol __Z6SelectP6HTNodei in:
    CMakeFiles/DataStructure_Huffman.dir/main.cpp.o
    CMakeFiles/DataStructure_Huffman.dir/Huffman.cpp.o
duplicate symbol __Z18create_HuffmanTreePi in:
    CMakeFiles/DataStructure_Huffman.dir/main.cpp.o
    CMakeFiles/DataStructure_Huffman.dir/Huffman.cpp.o
duplicate symbol __Z11TestHufTreeP6HTNode in:
    CMakeFiles/DataStructure_Huffman.dir/main.cpp.o
    CMakeFiles/DataStructure_Huffman.dir/Huffman.cpp.o
ld: 3 duplicate symbols for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [DataStructure_Huffman] Error 1
make[2]: *** [CMakeFiles/DataStructure_Huffman.dir/all] Error 2
make[1]: *** [CMakeFiles/DataStructure_Huffman.dir/rule] Error 2
make: *** [DataStructure_Huffman] Error 2

main.cpp

#include <iostream>
#include <stdlib.h>
#include "Huffman.cpp"
using namespace std;

int main() {
    cout<< "=========Huffman文件压缩=========" <<endl;
    cout<<"请输入文件名:";
    char filename[256];
    cin>>filename;

    int weight[256] = {0};

    FILE *in = fopen(filename,"rb");
    int ch;

    while ((ch = fgetc(in)) != EOF) {
        weight[ch]++;
    }

    fclose(in);

    cout<<"Byte"<<" Weight"<<endl;
    for (int i = 0; i < 256 ; ++i) {
        printf("0x%02X %d\n",i,weight[i]);
    }

    HuffmanTree HT = create_HuffmanTree(weight);

    cout<<"Byte"<<" Weight"<<" Parent"<<" Lchild"<<" Rchild"<<endl;
    TestHufTree(HT);

    return 0;
}

Huffman.cpp

#include "Huffman.h"
#include <iostream>



int Select(HuffmanTree pHT,int nSize) {
    int minValue = 0x7FFFFFFF;
    int min = 0;

    for (int i = 0; i <= nSize ; ++i) {
        if(pHT[i].parent == -1 && pHT[i].weight < minValue) {

            minValue = pHT[i].weight;
            min = i;
        }
    }

    pHT[min].parent = 1;

    return min;
}

HuffmanTree create_HuffmanTree(int weight[]) {
    /*
根据给定的n个权值构造一棵赫夫曼树,wet中存放n个权值
*/


        HuffmanTree HT = (HuffmanTree)malloc(511*sizeof(HTNode));
        int i;
        //一棵有n个叶子节点的赫夫曼树共有2n-1个节点


        //以下初始化序号全部用-1表示，
        //这样在编码函数中进行循环判断parent或lchild或rchild的序号时，
        //不会与HT数组中的任何一个下标混淆

        //HT[0],HT[1]...HT[n-1]中存放需要编码的n个叶子节点
        for(i=0;i<256;i++)
        {
            HT[i].parent = -1;
            HT[i].lchild = -1;
            HT[i].rchild = -1;
            HT[i].weight = weight[i];
        }

        //HT[n],HT[n+1]...HT[2n-2]中存放的是中间构造出的每棵二叉树的根节点
        for(;i< 511;i++)
        {
            HT[i].parent = -1;
            HT[i].lchild = -1;
            HT[i].rchild = -1;
            HT[i].weight = 0;
        }

        int min1,min2; //用来保存每一轮选出的两个weight最小且parent为0的节点
        //每一轮比较后选择出min1和min2构成一课二叉树,最后构成一棵赫夫曼树
        for(i = 256;i< 511;i++)
        {
            min1 = Select(HT,i);
            min2 = Select(HT,i);
            HT[min1].parent = i;
            HT[min2].parent = i;
            //这里左孩子和右孩子可以反过来，构成的也是一棵赫夫曼树，只是所得的编码不同
            HT[i].lchild = min1;
            HT[i].rchild = min2;
            HT[i].weight =HT[min1].weight + HT[min2].weight;
        }
        return HT;

}

void TestHufTree(HuffmanTree pHT) {

    for (int i = 0; i < 511 ; ++i) {
        printf("pHT[%d]\t\d\t\d\t\d\t\d\n",i,pHT[i].weight,pHT[i].parent,pHT[i].lchild,pHT[i].rchild);
    }
}

Huffman.h

#ifndef DATASTRUCTURE_HUFFMAN_HUFFMAN_H
#define DATASTRUCTURE_HUFFMAN_HUFFMAN_H
struct HTNode {
    int weight;
    int parent;
    int lchild;
    int rchild;
};

typedef HTNode *HuffmanTree;
#endif //DATASTRUCTURE_HUFFMAN_HUFFMAN_H

cmake_minimum_required(VERSION 3.5)
project(DataStructure_Huffman)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(SOURCE_FILES main.cpp Huffman.cpp)
add_executable(DataStructure_Huffman ${SOURCE_FILES} Huffman.h)

Answer 1

I will use g++ to compile your source code
in main.cpp,

#include "Huffman.cpp" 

should be changed to

#include "Huffman.h"

And add function declaration in Huffman.h.

HuffmanTree create_HuffmanTree(int weight[]);
void TestHufTree(HuffmanTree pHT);

You can take this opportunity to learn more about header file inclusion and why this is wrong.