View Compilation Error

0_0_33044966_27820.cpp: In constructor 'UFS::UFS()':
0_0_33044966_27820.cpp:12:32: error: 'memset' was not declared in this scope
   UFS () {memset(fa,0,sizeof fa);}
                                ^
0_0_33044966_27820.cpp: In constructor 'EDGE::EDGE()':
0_0_33044966_27820.cpp:31:34: error: 'memset' was not declared in this scope
     memset(point, 0, sizeof point), memset(next, 0, sizeof next),
                                  ^
0_0_33044966_27820.cpp: In constructor 'TARJAN::TARJAN()':
0_0_33044966_27820.cpp:48:30: error: 'memset' was not declared in this scope
     memset(DFN, 0, sizeof DFN), memset(LOW, 0, sizeof LOW),
                              ^