View Compilation Error

0_0_26262611_16545.cpp:5:7: error: 'll' does not name a type
 const ll INF = 0x3f3f3f3f3f3f3f3f;
       ^
0_0_26262611_16545.cpp: In function 'll maxflow(int, int)':
0_0_26262611_16545.cpp:104:25: error: 'INF' was not declared in this scope
         flow += dfs(beg,INF,end);
                         ^