class Solution {
public:
    bool Find(int target, vector<vector<int> > array) {
        int row = array.size(), column = array[0].size();
        int i = 0, j = column-1;
        bool flag = false;
        while(i < row && j >= 0){
            if(array[i][j] == target)
            {flag = true; break;}
            if(array[i][j] < target)
                ++i;
            else
                --j;
        }
        return flag;
    }
};