View Compilation Error

0_0_15532089_21625.cpp: In function 'void init()':
0_0_15532089_21625.cpp:45:27: error: 'memset' was not declared in this scope
     memset(g ,0 , sizeof g);
                           ^
0_0_15532089_21625.cpp: In function 'void bfs()':
0_0_15532089_21625.cpp:55:33: error: 'memset' was not declared in this scope
     memset(dist, 0 , sizeof dist);
                                 ^
0_0_15532089_21625.cpp: In function 'int maxflow()':
0_0_15532089_21625.cpp:92:35: error: 'memset' was not declared in this scope
         memset(vis, 0 , sizeof vis);
                                   ^
0_0_15532089_21625.cpp: In function 'void mark_dead()':
0_0_15532089_21625.cpp:142:33: error: 'memset' was not declared in this scope
     memset(dead, 0 , sizeof dead);
                                 ^
0_0_15532089_21625.cpp: In function 'void process(int)':
0_0_15532089_21625.cpp:214:43: error: 'memset' was not declared in this scope
     memset(block_adj , 0 ,sizeof block_adj);
                                           ^