View Compilation Error

0_0_32897863_29135.cpp:28:1: error: '_int64' does not name a type
 _int64 query(int x) {
 ^
0_0_32897863_29135.cpp: In function 'int main()':
0_0_32897863_29135.cpp:62:24: error: 'query' was not declared in this scope
    m = m + query(b[i]-1);
                        ^