View Compilation Error

0_0_25317118_13841.cpp: In function 'int wanshu(int)':
0_0_25317118_13841.cpp:19:1: error: a function-definition is not allowed here before '{' token
 {
 ^
0_0_25317118_13841.cpp:40:1: error: expected '}' at end of input
 }
 ^