View Compilation Error

0_0_28491440_18296.cpp: In function 'int main()':
0_0_28491440_18296.cpp:18:23: error: 'memset' was not declared in this scope
 memset(br,0,sizeof(br));
                       ^
0_0_28491440_18296.cpp:36:24: error: expected primary-expression before '?' token
 for(int i=10000; i>=1; ?i)
                        ^
0_0_28491440_18296.cpp:36:26: error: expected ':' before ')' token
 for(int i=10000; i>=1; ?i)
                          ^
0_0_28491440_18296.cpp:36:26: error: expected primary-expression before ')' token