View Compilation Error

0_0_16351954_1755.cpp: In function 'int check()':
0_0_16351954_1755.cpp:12:33: error: 'memset' was not declared in this scope
         memset(vis,0,sizeof(vis));
                                 ^
0_0_16351954_1755.cpp:27:33: error: 'memset' was not declared in this scope
         memset(vis,0,sizeof(vis));
                                 ^