View Compilation Error

0_0_37013089_6793.cpp: In function 'int dfs(int, int, int, int)':
0_0_37013089_6793.cpp:50:18: error: 'DP' was not declared in this scope
     if(!limit && DP[pos][pre][status] != -1)
                  ^
0_0_37013089_6793.cpp:67:10: error: 'DP' was not declared in this scope
          DP[pos][pre][status] = ret;
          ^