View Compilation Error

0_0_24916551_12054.cpp: In member function 'int AhoCorasickAutomata::dfs(int, int, int, int)':
0_0_24916551_12054.cpp:134:13: error: 'vis' was not declared in this scope
         if (vis[u][x][pos]) return dp[u][x][pos];
             ^
0_0_24916551_12054.cpp:145:9: error: 'vis' was not declared in this scope
         vis[u][x][pos] = true;
         ^