View Compilation Error

0_0_29863201_11597.cpp: In function 'bool bfs(int, int)':
0_0_29863201_11597.cpp:82:36: error: 'memset' was not declared in this scope
     memset(level, -1, sizeof(level));
                                    ^
0_0_29863201_11597.cpp: In function 'void init()':
0_0_29863201_11597.cpp:134:25: error: 'memset' was not declared in this scope
     memset(g,0,sizeof(g));
                         ^