View Compilation Error

0_0_8632691_4705.cpp:6: error: expected `]' before ';' token
0_0_8632691_4705.cpp:6: error: expected unqualified-id before ']' token
0_0_8632691_4705.cpp:6: error: expected `,' or `;' before ']' token
0_0_8632691_4705.cpp: In function `void add(int)':
0_0_8632691_4705.cpp:11: error: `d' undeclared (first use this function)
0_0_8632691_4705.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8632691_4705.cpp: In function `int query(int)':
0_0_8632691_4705.cpp:17: error: `d' undeclared (first use this function)
0_0_8632691_4705.cpp: In function `int main()':
0_0_8632691_4705.cpp:27: error: `d' undeclared (first use this function)
0_0_8632691_4705.cpp:31: error: `a' undeclared (first use this function)