View Compilation Error

0_0_34118966_30232.cpp: In function 'int main()':
0_0_34118966_30232.cpp:37:34: error: 'memset' was not declared in this scope
        memset(Map,0x3f,sizeof Map);
                                  ^
0_0_34118966_30232.cpp:42:27: error: 'a' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                           ^
0_0_34118966_30232.cpp:42:30: error: 'b' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                              ^
0_0_34118966_30232.cpp:42:33: error: 'c' was not declared in this scope
         scanf("%d %d %d",&a,&b,&c);
                                 ^