View Compilation Error

0_0_29963899_19670.cpp:4:9: error: 'bign' does not name a type
 typedef bign __int128;
         ^
0_0_29963899_19670.cpp:49:1: error: 'bign' does not name a type
 bign quickpow(bign m,bign n,bign mod){
 ^
0_0_29963899_19670.cpp:59:1: error: 'bign' does not name a type
 bign getans(int k, bign p) {
 ^
0_0_29963899_19670.cpp: In function 'int main()':
0_0_29963899_19670.cpp:81:32: error: 'bign' was not declared in this scope
         cout<< getans(k, bign(p))<<endl;
                                ^
0_0_29963899_19670.cpp:81:33: error: 'getans' was not declared in this scope
         cout<< getans(k, bign(p))<<endl;
                                 ^