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