View Compilation Error

0_0_24874959_10356.cpp: In function 'int main()':
0_0_24874959_10356.cpp:90:29: error: 'memset' was not declared in this scope
    memset(used,0,sizeof used);
                             ^
0_0_24874959_10356.cpp:106:9: error: expected '}' at end of input
 return 0;
         ^