View Compilation Error

0_0_22123803_21286.cpp: In function 'void init()':
0_0_22123803_21286.cpp:32:24: error: 'memset' was not declared in this scope
  memset(g, 0, sizeof(g));
                        ^
0_0_22123803_21286.cpp: In function 'void bfs()':
0_0_22123803_21286.cpp:42:30: error: 'memset' was not declared in this scope
  memset(dist, 0, sizeof(dist));
                              ^
0_0_22123803_21286.cpp: In function 'int maxflow()':
0_0_22123803_21286.cpp:92:29: error: 'memset' was not declared in this scope
   memset(vis, 0, sizeof(vis));
                             ^