class Solution {
public:
    bool searchArray(vector<int>& arr, int target) {
        int l = 0, r = arr.size();
        while(l < r - 1) {
            int m = (l + r) / 2;
            if (arr[m] > target) {
                r = m;
            } else {
                l = m;
            }
        }
        if (arr[l] == target)
            return true;
    }
    bool searchMatrix(vector<vector<int>>& matrix, int target) {
        for (auto &arr: matrix) {
            if (searchArray(arr, target))
                return true;
        }
        return false;
    }
};