Leetcode-1002 Find Common Characters(查找常用字符)

#define pb push_back
#define maxSize 3939
#define _for(i,a,b) for(int i = (a);i < (b);i ++)

const int N = 101;
class Solution
{
    public:
        vector<string> commonChars(vector<string>& A)
        {
            int hash[N][N]; 
            memset(hash,0,sizeof(hash));
            
            int sz = A.size();
            _for(i,0,sz)
            {
                _for(j,0,A[i].size())
                {
                    hash[i][A[i][j]-'a'] ++;
                }
            }
            
            vector<string> rnt;
            for(int i = 0;i < 26;i ++)
            {
                int mm = INT_MAX;
                for(int j = 0;j < sz;j ++)
                {
                    mm = min(mm,hash[j][i]);
                }
                char aaa = 'a'+i;
                string aa;
                aa += aaa;
                for(int j = 0;j < mm;j ++)
                {
                    rnt.push_back(aa);
                }
            }
            return rnt;
        }
};

水题，没啥好说的