View Compilation Error

0_0_4670491_18991.cpp:2: error: expected constructor, destructor, or type conversion before ';' token
0_0_4670491_18991.cpp: In function `LL pow2(LL, LL, int)':
0_0_4670491_18991.cpp:7: error: `nbsp' undeclared (first use this function)
0_0_4670491_18991.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4670491_18991.cpp: In function `int main()':
0_0_4670491_18991.cpp:18: error: `nbsp' undeclared (first use this function)