年迈的战士已经挂上了奥金斧，年轻的战士还在挨打（->我）
看完别人的代码再看我的代码就是一坨翔..

class Solution{
public:
    int appearnum[300];
    int firstloc[300];
    char mat[100000];
    int loc=0;
    //Insert one char from stringstream
    void insert(char ch){
        mat[loc]=ch;loc++;
        int k=(int)ch;
        if(appearnum[k]==0){
            firstloc[k]=loc-1;
        }
        appearnum[k]++;
    }
    //return the first appearence once char in current stringstream
    char firstAppearingOnce(){
        int minn=999;
        char ret='#';
        for(int i=0;i<=178;i++){
            if(appearnum[i]==1){
                if(firstloc[i]<minn){
                    minn=firstloc[i];
                    ret=(char)i;
                }
            }
        }
        return ret;
    }
};