一个关于 C 语言 哈夫曼编码 的问题

[ech0x]

代码如下：

#include <stdio.h>
#include <limits.h>
#define MAXLEN 100
typedef struct Huffman{
    char val;
    int parents;
    int lchild,rchild;
    int weight;
} Huffman;
int n;//the input number
Huffman HuffmanList[MAXLEN];
void BuildHuffman(Huffman HuffmanList[]){
    for(int i=0;i<n-1;i++){
        int MAXL,MAXR;
        int LOCAL_L,LOCAL_R;
        MAXL=MAXR=INT_MAX;
        LOCAL_L=LOCAL_R=0;
        for(int j=0;j<n+i;j++){
            if(HuffmanList[j].weight<MAXL && HuffmanList[j].parents==-1){
                MAXL=HuffmanList[j].weight;
                LOCAL_L=j;
            }
        }
        for(int j=0;j<n+i;j++){
            if(HuffmanList[j].weight<MAXR && HuffmanList[j].parents==-1 && j!=LOCAL_L){
                MAXR=HuffmanList[j].weight;
                LOCAL_R=j;
            }
        }
        HuffmanList[n+i].lchild=LOCAL_L;
        HuffmanList[n+i].rchild=LOCAL_R;
        HuffmanList[n+i].weight=HuffmanList[LOCAL_L].weight+HuffmanList[LOCAL_R].weight;
        HuffmanList[LOCAL_L].parents=n+i;
        HuffmanList[LOCAL_R].parents=n+i;
    }
}
void CodeHuffman(Huffman HuffmanNode,char n){
    if(HuffmanNode.val=='\0'){
        printf("%c",n);
        CodeHuffman(HuffmanList[HuffmanNode.lchild],'0');
        printf("%c",n);
        CodeHuffman(HuffmanList[HuffmanNode.rchild],'1');
    }else{
        printf("%c",n);
        printf("   val is %c\n",HuffmanNode.val);
    }
    return;
}
int main(){
    printf("Please input n\n");
    scanf("%d",&n);
    for(int i=0;i<2*n-1;i++){
        HuffmanList[i].val='\0';
        HuffmanList[i].parents=-1;
        HuffmanList[i].lchild=-1;
        HuffmanList[i].rchild=-1;
        HuffmanList[i].weight=-1;
    }
    printf("Please input val:\n");
    for(int i=0;i<n;i++){
        scanf(" %c",&HuffmanList[i].val);
    }
    printf("Please input weight:\n");
    for(int i=0;i<n;i++){
        scanf("%d",&HuffmanList[i].weight);
    }
    BuildHuffman(HuffmanList);
    CodeHuffman(HuffmanList[2*n-2],'\0');
    /*
    for(int i=0;i<2*n-1;i++){
        printf("%c:%d:%d:%d:%d\n",HuffmanList[i].val,HuffmanList[i].lchild,HuffmanList[i].rchild,HuffmanList[i].parents,HuffmanList[i].weight);
    }
    */
}

在输入权重同时包括 1，2 时，权值为 2 的项哈夫曼编码会有问题。

比如 输入 权值为 1，2，3，4 时，哈夫曼编码错误。

但是输入权值为 2，3，4，5 时，哈夫曼编码又正确。

求原因.......

[ech0x]

求解为什么.......