1899

class Solution {
public:
    bool mergeTriplets(vector<vector<int>>& a, vector<int>& b) {
        int x=0, y=0, z=0;
        for(auto &v : a) {
            if(v[0]<=b[0] && v[1]<=b[1] && v[2]<=b[2]) {
                x=max(x, v[0]);
                y=max(y, v[1]);
                z=max(z, v[2]);
            }
        }
        return x==b[0] && y==b[1] && z==b[2];
    }
};