View Compilation Error

0_0_21740851_17366.cpp:9:18: error: 'maxn' was not declared in this scope
 pair<int, int> g[maxn];
                  ^
0_0_21740851_17366.cpp: In function 'std::pair<int, int> dfs(int, int, int, int)':
0_0_21740851_17366.cpp:17:4: error: 'g' was not declared in this scope
    g[y] = dfs(y, x, X, Y);
    ^
0_0_21740851_17366.cpp:24:16: error: 'g' was not declared in this scope
    T.push_back(g[y]);
                ^