View Compilation Error

0_0_30301874_24497.cpp: In function 'll a(ll)':
0_0_30301874_24497.cpp:65:4: error: redefinition of 'll a(ll)'
 ll a(ll x){
    ^
0_0_30301874_24497.cpp:62:4: note: 'll a(ll)' previously defined here
 ll a(ll b){
    ^